The word significant appears often in academic, professional, business, and everyday English.
It can describe something that is important, large enough to matter, worthy of attention, or likely to have an effect.
For example:
The study found a significant difference.
Depending on what you mean, you could write:
The study found an important difference.
The study found a substantial difference.
The study found a notable difference.
The study found a considerable difference.
These words are related, but they are not interchangeable in every sentence.
Significant is especially useful because it can describe both importance and size or degree.
In statistics, it also has a specific technical meaning.
Choosing the right synonym therefore depends on the context.
Meaning of Significant
Significant means important, meaningful, noticeable, considerable, or likely to have an important effect.
Definition
Significant: important enough to be noticed, considered, or have an effect.
Common Uses
Importance:
This is a significant decision.
Amount:
The company experienced a significant increase in sales.
Effect:
The policy had a significant impact.
Achievement:
She made significant progress.
Statistics:
The results were statistically significant.
Pronunciation
Significant is pronounced:
/sɪɡˈnɪfɪkənt/
It sounds like:
sig-NIF-uh-kunt
The main stress falls on NIF:
sig-NIF-i-cant
Part of Speech
Significant is mainly an adjective.
This was a significant achievement.
Related forms include:
- Significance — noun
- Significantly — adverb
- Signify — verb
- Significant — adjective
Examples
The discovery has great significance.
Sales increased significantly.
The symbol signifies peace.
Synonyms for Significant
| Word | Meaning | Usage | Formality | Example | Difficulty |
| Important | Having great value or effect | General | Neutral | This is an important issue. | Easy |
| Meaningful | Having value or purpose | Personal, social | Neutral | It was a meaningful change. | Easy |
| Notable | Worth noticing | Achievements, facts | Formal | She made a notable contribution. | Medium |
| Substantial | Large in amount or degree | Results, amounts | Formal | There was a substantial increase. | Medium |
| Considerable | Fairly large or important | Amounts, effects | Formal | The project required considerable effort. | Medium |
| Major | Very important or large | Events, changes | Neutral | This was a major development. | Easy |
| Critical | Extremely important | Decisions, situations | Formal | It is a critical issue. | Medium |
| Consequential | Having important results | Decisions, actions | Formal | It was a consequential decision. | Advanced |
| Influential | Having an effect on others | People, ideas | Neutral/Formal | She was an influential leader. | Medium |
| Remarkable | Unusually impressive | Achievements, progress | Formal | He made remarkable progress. | Medium |
| Relevant | Directly related or useful | Information, issues | Formal | This evidence is relevant. | Easy |
| Prominent | Important or well-known | People, roles, features | Formal | He is a prominent researcher. | Medium |
| Salient | Most noticeable or important | Facts, features | Formal | The report highlights salient points. | Advanced |
| Material | Important enough to affect a decision | Business, legal, finance | Formal | The error was material. | Advanced |
| Vital | Absolutely necessary | Health, plans, decisions | Formal | Communication is vital. | Easy |
| Essential | Completely necessary | General | Neutral | This step is essential. | Easy |
| Crucial | Extremely important | Decisions, actions | Neutral/Formal | Timing is crucial. | Medium |
| Pivotal | Extremely important to an outcome | Events, decisions | Formal | It was a pivotal moment. | Medium |
| Momentous | Very important and historic | Events, decisions | Formal | It was a momentous occasion. | Advanced |
| Weighty | Serious and important | Matters, issues | Formal | They discussed weighty matters. | Advanced |
| Serious | Important or requiring attention | Problems, situations | Neutral | This is a serious concern. | Easy |
| Valuable | Worthwhile or useful | Information, contributions | Neutral | Her advice was valuable. | Easy |
| Noteworthy | Worthy of attention | Results, achievements | Formal | The result was noteworthy. | Medium |
| Pronounced | Very noticeable | Differences, effects | Formal | There was a pronounced change. | Advanced |
| Marked | Clearly noticeable | Changes, differences | Formal | The treatment produced a marked improvement. | Advanced |
| Extensive | Large in range or scope | Research, damage | Neutral/Formal | The project required extensive work. | Medium |
| Far-reaching | Having effects over a wide area | Policies, decisions | Formal | The law had far-reaching effects. | Medium |
| Profound | Deep or powerful | Effects, ideas | Formal | The experience had a profound impact. | Medium |
| Powerful | Having a strong effect | Ideas, messages | Neutral | It was a powerful argument. | Easy |
| Impactful | Having a strong effect | Business, communication | Neutral | It was an impactful campaign. | Medium |
| Serious | Important and requiring attention | Issues | Neutral | This is a serious matter. | Easy |
| Outstanding | Exceptionally important or good | Performance, achievement | Neutral | She made an outstanding contribution. | Medium |
| Distinguished | Notable and respected | People, careers | Formal | He had a distinguished career. | Advanced |
| Substantive | Having real importance or substance | Academic, legal | Formal | The report made substantive changes. | Advanced |
| Central | Most important to a matter | Ideas, issues | Neutral | Trust is central to the process. | Easy |
| Core | Most important or basic | Ideas, values | Neutral | Safety is a core concern. | Easy |
| Key | Extremely important | General | Neutral | This is a key factor. | Easy |
| Decisive | Producing a definite result | Actions, factors | Formal | It was a decisive factor. | Medium |
| Determining | Having a major influence on an outcome | Factors | Formal | Cost was the determining factor. | Medium |
| Significant | Important or noticeable | General | Neutral/Formal | The change was significant. | Easy |
Best Synonyms for Significant
1. Important
Important is the simplest and most general synonym for significant.
This is an important decision.
Difference
Significant can also mean large or noticeable. Important focuses more directly on value or importance.
Best Situation
Use important in:
- everyday conversation
- emails
- general writing
- explanations
2. Meaningful
Meaningful means having value, purpose, or emotional importance.
The conversation was meaningful.
Use it when something matters because of its personal, social, or emotional value.
3. Notable
Notable means worthy of attention or mention.
She made a notable contribution to the project.
It is especially useful in formal writing.
4. Substantial
Substantial means large, considerable, or significant in amount or degree.
The company saw a substantial increase in revenue.
It is often better than significant when you want to emphasize size or quantity.
5. Considerable
Considerable means fairly large or important.
The project required considerable effort.
It is useful for describing amounts, effort, influence, cost, or impact.
6. Major
Major means very important, large, or serious.
The company announced a major change.
It is simple and natural in both speech and writing.
7. Critical
Critical means extremely important or necessary.
Accurate data is critical to the study.
It is stronger than ordinary significant.
8. Consequential
Consequential means having important effects or results.
The decision was highly consequential.
Use it when you want to emphasize the outcome of an action.
9. Influential
Influential means having the power to affect people, decisions, or events.
She was an influential researcher.
It is best for:
- people
- ideas
- organizations
- movements
- policies
10. Remarkable
Remarkable means unusually impressive or worthy of attention.
She made remarkable progress.
It is stronger and more expressive than simply saying something is significant.
11. Relevant
Relevant means directly connected to a particular subject or situation.
This information is relevant to the discussion.
It is not always a direct synonym for significant, but it can work when significance comes from usefulness or connection.
12. Crucial
Crucial means extremely important to success or an outcome.
Timing was crucial to the project’s success.
It suggests that something could strongly affect the result.
13. Pivotal
Pivotal means extremely important because it can determine what happens next.
The meeting was a pivotal moment.
It is particularly useful for major turning points.
14. Profound
Profound means deep, powerful, or having a strong effect.
The experience had a profound impact on her life.
Use it when significance is deep or far-reaching.
15. Far-Reaching
Far-reaching describes something with effects that extend widely.
The decision had far-reaching consequences.
It is especially useful for:
- laws
- policies
- decisions
- social changes
- technological developments
Synonyms for Significant by Context
Significant Person
Use:
- influential
- prominent
- notable
- distinguished
- important
- respected
- renowned
Example:
She was an influential researcher.
Significant Achievement
Use:
- remarkable
- notable
- exceptional
- outstanding
- major
- impressive
- substantial
Example:
She made a remarkable achievement.
More naturally:
She made remarkable progress.
Significant Change
Use:
- substantial
- considerable
- major
- notable
- pronounced
- marked
- dramatic
Example:
The company experienced a substantial change in demand.
Significant Difference
Use:
- notable
- substantial
- considerable
- marked
- pronounced
- clear
Example:
Researchers observed a marked difference between the groups.
Significant Impact
Use:
- substantial impact
- major impact
- profound impact
- considerable impact
- far-reaching impact
- powerful impact
Example:
The policy had a profound impact on local communities.
Significant Event
Use:
- important
- major
- momentous
- historic
- memorable
- pivotal
- consequential
Example:
It was a pivotal event in the company’s history.
Significant Amount
Use:
- substantial
- considerable
- large
- sizeable
- extensive
Example:
The project required a substantial amount of funding.
Significant Role
Use:
- important role
- crucial role
- central role
- key role
- influential role
Example:
Technology played a crucial role in the project.
Antonyms of Significant
| Antonym | Meaning | Example |
| Insignificant | Not important | The error was insignificant. |
| Unimportant | Lacking importance | It was an unimportant detail. |
| Minor | Small or less important | It was a minor issue. |
| Trivial | Not serious or important | The mistake was trivial. |
| Negligible | So small it can be ignored | The cost was negligible. |
| Irrelevant | Not related or useful | That information is irrelevant. |
| Ordinary | Normal or unremarkable | It was an ordinary event. |
| Common | Frequently occurring | It is a common problem. |
| Minimal | Very small | The impact was minimal. |
| Inconsequential | Having little effect | The decision was inconsequential. |
| Meaningless | Without meaning or value | The gesture felt meaningless. |
| Superficial | Lacking depth | The analysis was superficial. |
| Minor | Not major | The change was minor. |
| Unremarkable | Not worthy of attention | The results were unremarkable. |
| Negligible | Too small to matter | The difference was negligible. |
Insignificant
This is the most direct opposite.
The difference was insignificant.
Minor
Minor means small or less important.
It was only a minor problem.
Negligible
Negligible means so small that it has almost no effect.
The difference in cost was negligible.
Irrelevant
Irrelevant means unrelated or not useful to the subject.
That information is irrelevant to the question.
30 Real-World Examples
- This was a significant achievement.
- The study found a significant difference.
- She made remarkable progress.
- The company experienced substantial growth.
- This is an important decision.
- The policy had a considerable impact.
- He played a crucial role in the project.
- It was a pivotal moment.
- She is an influential leader.
- The event was historically significant.
- The discovery was notable.
- The change was substantial.
- The results were statistically significant.
- This information is highly relevant.
- The decision had far-reaching consequences.
- She made a meaningful contribution.
- The project required considerable investment.
- The team achieved a major milestone.
- The experience had a profound effect.
- The difference was clearly noticeable.
- The findings were noteworthy.
- Communication is critical to success.
- The issue is central to the discussion.
- Safety is a key concern.
- The new evidence was highly consequential.
- The company made a marked improvement.
- The study reported a pronounced change.
- The award was a significant milestone.
- Her contribution was substantial.
- The decision was decisive for the project’s future.
25 Naturally Written Sentences
- This was a significant achievement for the team.
- The researchers found a notable difference between the groups.
- The company experienced substantial growth last year.
- She made considerable progress in a short time.
- This is an important decision.
- The new policy could have far-reaching effects.
- He played a crucial role in the project’s success.
- The meeting became a pivotal moment for the organization.
- She is an influential voice in the industry.
- The discovery was remarkable.
- The change had a profound effect on the community.
- The results showed a substantial improvement.
- This information is highly relevant to our discussion.
- The project requires considerable investment.
- Communication is critical to success.
- The team reached a major milestone.
- Her contribution was meaningful and valuable.
- The report highlights several noteworthy findings.
- The difference between the two results was pronounced.
- The decision had significant consequences.
- Safety remains a central concern.
- Cost was a determining factor.
- The treatment produced a marked improvement.
- The event was a memorable and significant milestone.
- The findings could have important implications for future research.
Formal vs. Informal Usage
| Informal | Neutral | Formal |
| Important | Significant | Consequential |
| Big | Major | Substantial |
| Really important | Very important | Critical |
| Big change | Major change | Substantial change |
| Big effect | Major impact | Profound impact |
| Stands out | Notable | Remarkable |
| Key | Important | Pivotal |
| Big difference | Clear difference | Pronounced difference |
Informal
That’s a really important change.
Neutral
That’s a significant change.
Formal
That’s a substantial change with important consequences.
For professional writing, significant itself is already appropriate. The key is choosing a more precise synonym when you need to emphasize size, importance, influence, or consequences.
Academic Usage
Significant is especially important in academic writing because it has a technical statistical meaning.
General Meaning
The study made a significant contribution to the field.
Here, significant means important.
Statistical Meaning
The results were statistically significant.
Here, statistically significant has a specific meaning related to statistical testing. It should not simply be replaced with important.
This distinction matters.
Instead of casually changing:
The results were statistically significant.
to:
The results were important.
you would lose the technical meaning.
Academic Alternatives
Depending on context:
- notable
- substantial
- considerable
- meaningful
- consequential
- important
- remarkable
- statistically meaningful
- pronounced
Daily Conversation
In everyday English, significant can sound more formal than important.
Instead of:
That’s a significant problem.
You might simply say:
That’s an important problem.
Instead of:
We made significant progress.
You could say:
We made a lot of progress.
However, significant is still natural in business, education, and professional conversations.
Grammar Tips
1. Significant + Noun
a significant change
a significant increase
a significant difference
a significant achievement
2. Significant to
This discovery is significant to the field.
3. Significant for
The change is significant for future research.
4. Significant in
This finding is significant in several ways.
5. Significantly + Verb
Sales increased significantly.
6. Significant Increase
The company reported a significant increase in revenue.
7. Significant Impact
The policy had a significant impact.
Common Collocations With Significant
Significant Change
The company underwent a significant change.
Significant Increase
There was a significant increase in demand.
Significant Decrease
The report showed a significant decrease in costs.
Significant Difference
Researchers found a significant difference.
Significant Impact
The decision had a significant impact.
Significant Role
Technology plays a significant role.
Significant Contribution
She made a significant contribution.
Significant Achievement
This was a significant achievement.
Significant Progress
The team made significant progress.
Significant Effect
The treatment had a significant effect.
Significant Amount
A significant amount of money was invested.
Significant Event
It was a significant event in history.
Common Phrases With Significant
Significant Difference
Often used in research, business, and comparison.
There was a significant difference between the two results.
Significant Impact
Used when something has an important effect.
Technology has a significant impact on education.
Significant Progress
Used when meaningful or noticeable improvement has occurred.
The team has made significant progress.
Significant Role
Used when something contributes strongly to an outcome.
Education plays a significant role in economic development.
Significant Milestone
Used for an important stage or achievement.
Reaching one million users was a significant milestone.
Similar Words
| Word | Meaning | Difference | Example |
| Significant | Important or noticeable | Broad and flexible | This is significant. |
| Important | Having value or influence | Simple general term | This is important. |
| Meaningful | Having value or purpose | More emotional/personal | It was meaningful. |
| Notable | Worth noticing | Formal and attention-focused | A notable achievement |
| Substantial | Large in amount or degree | Focuses on size | A substantial increase |
| Considerable | Fairly large or important | Focuses on amount/degree | Considerable effort |
| Major | Very important or large | Simple and strong | A major change |
| Critical | Extremely important | Stronger than significant | A critical issue |
| Consequential | Producing important results | Focuses on outcomes | A consequential decision |
| Influential | Having power to affect others | Focuses on influence | An influential leader |
| Remarkable | Unusually impressive | Focuses on attention | Remarkable progress |
| Relevant | Connected or useful | Focuses on connection | Relevant information |
| Crucial | Necessary for success | Strong importance | A crucial factor |
| Pivotal | Determining an outcome | Focuses on turning points | A pivotal moment |
| Profound | Deep or powerful | Focuses on depth | A profound impact |
Significant vs. Important
Important is the simplest general synonym.
This is an important issue.
Significant sounds more formal and can also describe a noticeable size or degree.
There was a significant increase in sales.
You cannot always replace significant with important when describing quantity.
Significant vs. Substantial
Substantial usually emphasizes size, amount, or degree.
The company experienced a substantial increase in sales.
Significant can emphasize either size or importance.
The company experienced a significant increase in sales.
Both are natural, but substantial is often more precise when you mean a large amount.
Significant vs. Notable
Notable means worthy of attention.
She made a notable contribution.
Significant can mean important or consequential.
Her contribution was significant.
Significant vs. Meaningful
Meaningful often suggests emotional, personal, or purposeful value.
It was a meaningful conversation.
Significant sounds more objective.
The conversation had significant consequences.
Significant vs. Major
Major is more direct and common.
The company announced a major change.
Significant can sound more measured and formal.
The company announced a significant change.
Significant vs. Critical
Critical is stronger.
Timing is significant.
means timing matters.
Timing is critical.
means timing is extremely important and may determine success or failure.
Significant vs. Consequential
Consequential specifically emphasizes results or consequences.
The decision was consequential.
This means the decision produced important effects
Common Mistakes
Mistake 1: Treating Significant as Meaning Only “Important”
Significant can also mean large or noticeable.
There was a significant increase in prices.
Here, the word describes the size of the increase.
Mistake 2: Using Statistically Significant as a General Compliment
Statistically significant has a technical meaning.
It does not simply mean “very important.”
Mistake 3: Overusing Significant
If you use significant in every paragraph, your writing can become vague.
Instead, be specific:
- substantial increase
- notable achievement
- critical factor
- profound impact
- pivotal moment
- meaningful contribution
Mistake 4: Confusing Significant With Relevant
Something can be relevant without being significant.
Relevant means connected to the topic.
Significant means important or consequential.
Expert Tips
1. Use Important for Simple Everyday Writing
This is an important issue.
2. Use Substantial for Large Amounts
There was a substantial increase.
3. Use Notable for Something Worth Mentioning
She made a notable contribution.
4. Use Critical for Extreme Importance
Safety is critical.
5. Use Pivotal for Turning Points
It was a pivotal moment.
6. Use Consequential for Results
It was a consequential decision.
7. Use Meaningful for Emotional Value
It was a meaningful conversation.
8. Use Influential for People or Ideas
She is an influential researcher.
9. Use Profound for Deep Effects
The experience had a profound impact.
10. Use Remarkable for Impressive Achievements
She made remarkable progress.
Q1. What is the best synonym for significant?
A: The best general synonym for significant is important. However, more precise alternatives include notable, substantial, considerable, meaningful, major, critical, remarkable, consequential, and influential. The correct choice depends on the meaning. Use substantial for size, critical for extreme importance, and consequential for important effects.
Q2. What is another word for significant?
A: Common alternatives include important, meaningful, notable, substantial, considerable, major, critical, remarkable, consequential, influential, relevant, crucial, pivotal, and momentous. Some focus on importance, while others describe size, influence, or consequences.
Q3. What is a formal synonym for significant?
A: Formal synonyms include notable, substantial, considerable, consequential, salient, material, pivotal, momentous, profound, and remarkable. In academic writing, notable, substantial, considerable, and significant itself are especially common.
Q4. What is a simple synonym for significant?
A: The simplest synonym is important. Other easy alternatives include major, meaningful, notable, and key. For example, “a significant decision” can often become “an important decision” in everyday writing.
Q5. Is important a synonym for significant?
A: Yes. Important is one of the closest general synonyms for significant. However, significant can also describe a large or noticeable amount, such as “a significant increase.” In that context, substantial or considerable may be more precise than important.
Q6. What is the difference between significant and important?
A: Both words can mean something matters. Important is simpler and more common in everyday English. Significant is more formal and can also describe something substantial, noticeable, or consequential. For example, “a significant increase” describes a noticeable increase, while “an important increase” sounds less natural.
Q7. What is the opposite of significant?
A: Common antonyms include insignificant, unimportant, minor, trivial, negligible, irrelevant, inconsequential, ordinary, and unremarkable. Insignificant is the most direct opposite. Negligible is useful when something is too small to matter, while irrelevant means unrelated rather than simply unimportant.
Q8. What is a synonym for significant in academic writing?
A: Useful academic alternatives include notable, substantial, considerable, meaningful, consequential, remarkable, pronounced, and important. However, when discussing statistical results, statistically significant is a technical term and should not be replaced casually with ordinary synonyms.
Q9. What is a synonym for significant in professional writing?
A: Professional alternatives include important, substantial, considerable, notable, major, critical, consequential, and key. The best word depends on the context. Use substantial for financial amounts, critical for urgent priorities, and notable for achievements or findings.
Q10. What is a stronger word than significant?
A: Depending on the context, stronger alternatives include critical, crucial, pivotal, profound, extraordinary, momentous, consequential, and substantial. Critical emphasizes extreme importance, pivotal suggests a turning point, and profound describes a deep effect.
Q11. What is a synonym for significant change?
A: Good alternatives include major change, substantial change, considerable change, notable change, marked change, pronounced change, and dramatic change. Substantial works well when the change is large, while marked and pronounced emphasize that the change is clearly noticeable.
Q12. What is a synonym for significant impact?
A: Strong alternatives include substantial impact, major impact, considerable impact, profound impact, powerful impact, and far-reaching impact. Profound suggests a deep effect, while far-reaching suggests that the effects extend widely.
Q13. What is a synonym for significant achievement?
A: Useful choices include remarkable achievement, major achievement, notable achievement, exceptional achievement, outstanding achievement, and important achievement. Remarkable is especially natural when you want to emphasize that the achievement deserves attention.
Q14. What is a synonym for significant difference?
A: Common alternatives include substantial difference, notable difference, considerable difference, marked difference, pronounced difference, and clear difference. In research writing, the correct choice depends on whether you are describing the size of a difference or its statistical significance.
Q15. How can I avoid repeating the word significant?
A: Choose a more precise synonym based on your intended meaning. Use substantial for large amounts, notable for things worth attention, critical for extreme importance, pivotal for turning points, meaningful for personal value, profound for deep effects, and consequential for important outcomes. This makes your writing more specific and natural.
Conclusion:
The best synonyms for significant depend on what you mean.
Important is the easiest general alternative, while notable means worthy of attention, substantial describes a large amount or degree, and meaningful focuses on value or purpose.
For stronger or more formal writing, critical, crucial, pivotal, consequential, profound, and remarkable can add greater precision.
The most effective approach is not to replace significant automatically.
First, decide whether you mean important, large, noticeable, influential, meaningful, or consequential.
Then choose the word that expresses that exact idea.
Grace Anderson is an English language editor based in Chicago, Illinois. She creates easy-to-understand vocabulary resources and enjoys making complex language concepts simple for everyday learners.