“Significant” does a lot of quiet, heavy lifting in English it can mean important, sizable, statistically meaningful, or even loaded with unspoken implication. Relying on it for every one of those jobs flattens the distinctions between them. This guide breaks down 65 synonyms for “significant,” organized by exactly which sense you mean, so your writing can be as precise as the idea behind it.
At-a-Glance
| Category | Top Synonyms | Best For | Tone |
|---|---|---|---|
| Importance | Important, Crucial, Vital | General emphasis on consequence | Neutral |
| Amount / Degree | Considerable, Substantial, Sizable | Measurable increases or changes | Neutral |
| Statistical / Technical | Statistically significant, Robust, Valid | Data, research, and analysis | Technical |
| Meaningful / Suggestive | Telling, Suggestive, Loaded | Looks, remarks, or unspoken implication | Figurative |
What Does “Significant” Mean?
Sense 1 — Important or Consequential: Having great importance or a meaningful effect. “This was a significant milestone for the company.”
Sense 2 — Considerable in Amount or Degree: Large enough to be noteworthy, especially in measurable terms. “There was a significant increase in sales this quarter.”
Sense 3 — Statistically Significant (Technical): In statistics, a result unlikely to have occurred by chance. “The difference between groups was statistically significant.”
Sense 4 — Meaningful or Suggestive: Carrying unspoken meaning or implication, especially in looks or remarks. “She gave him a significant glance across the table.”
Word Family
Significant (adjective) → Significantly (adverb) → Significance (noun) → Signify (verb) → Insignificant (antonym adjective)
Etymology
“Significant” comes from Latin “significans,” the present participle of “significare,” meaning “to signify” or “to indicate,” itself built from “signum” (“sign”) and “facere” (“to make”). The word entered English in the 15th century carrying the sense of “having meaning” — a sense that survives today in phrases like “a significant look,” even as the more common modern meaning of “important” developed alongside it.
Connotation
Most general synonyms — “important,” “notable,” “considerable” — are neutral and widely applicable. Words like “momentous,” “landmark,” and “historic” add real weight and drama, best reserved for genuinely major events. The statistical sense (“robust,” “valid,” “statistically significant”) is precise and technical, out of place in casual writing. And the meaningful/suggestive sense (“telling,” “loaded,” “knowing”) carries a sense of hidden implication that’s distinct from either importance or size.
Synonyms by Context
Importance or Consequence
Important, Crucial, Vital, Critical, Key, Central, Essential, Influential
Amount or Degree
Considerable, Substantial, Sizable, Appreciable, Ample, Extensive, Perceptible, Discernible
Statistical or Technical
Statistically significant, Robust, Valid, Non-trivial, Material
Meaningful or Suggestive
Telling, Suggestive, Pointed, Loaded, Knowing, Eloquent, Revealing
Historic or Momentous
Momentous, Landmark, Historic, Groundbreaking, Epoch-making, Defining, Formative
Main Synonym List
1. Important
Part of Speech: Adjective
Meaning: Of great value, effect, or consequence.
Best Used For: General, all-purpose emphasis.
Example: “This is an important step in the process.”
Nuance: The most neutral, everyday substitute for “significant.”
Synonym Strength: Strong, near-direct match.
2. Notable
Part of Speech: Adjective
Meaning: Worthy of attention or notice.
Best Used For: Achievements, exceptions, or standout details.
Example: “There were a few notable exceptions to the rule.”
Nuance: Focuses on standing out rather than sheer importance.
Synonym Strength: Strong for standout details.
3. Considerable
Part of Speech: Adjective
Meaning: Notably large in amount, extent, or degree.
Best Used For: Quantities, sums, or measurable change.
Example: “The project required a considerable investment of time.”
Nuance: Leans toward the amount/degree sense specifically.
Synonym Strength: Strong for amounts/degree.
4. Substantial
Part of Speech: Adjective
Meaning: Of considerable importance, size, or worth.
Best Used For: Financial, structural, or measurable emphasis.
Example: “They made substantial progress on the report.”
Nuance: Formal and precise, common in business writing.
Synonym Strength: Strong for measurable progress/amounts.
5. Momentous
Part of Speech: Adjective
Meaning: Of great importance, especially regarding future events.
Best Used For: Historic decisions or turning points.
Example: “It was a momentous day for the country.”
Nuance: Dramatic and elevated, reserved for major events.
Synonym Strength: Strong for historic/major events only.
6. Meaningful
Part of Speech: Adjective
Meaning: Having a serious, important, or deeply felt quality.
Best Used For: Relationships, experiences, or personal impact.
Example: “They had a meaningful conversation about the future.”
Nuance: Emphasizes emotional or personal weight.
Synonym Strength: Strong for personal/emotional contexts.
7. Consequential
Part of Speech: Adjective
Meaning: Having important or far-reaching effects.
Best Used For: Decisions or actions with lasting impact.
Example: “It was one of the most consequential rulings of the decade.”
Nuance: Formal, emphasizes downstream effects specifically.
Synonym Strength: Strong for cause-and-effect contexts.
8. Noteworthy
Part of Speech: Adjective
Meaning: Deserving attention or notice.
Best Used For: Highlighting a specific detail or achievement.
Example: “Her contribution to the project was especially noteworthy.”
Nuance: Similar to “notable,” slightly more formal.
Synonym Strength: Strong for singling out details.
9. Major
Part of Speech: Adjective
Meaning: Important or serious in extent or significance.
Best Used For: Everyday, direct emphasis.
Example: “There was a major breakthrough in the research.”
Nuance: Simple and direct, slightly informal.
Synonym Strength: Strong, everyday match.
10. Weighty
Part of Speech: Adjective
Meaning: Important and serious; deserving careful thought.
Best Used For: Decisions, matters, or topics of consequence.
Example: “It was a weighty matter for the board to decide.”
Nuance: Slightly formal, implies gravity.
Synonym Strength: Strong for serious matters.
11. Critical
Part of Speech: Adjective
Meaning: Of decisive importance; essential to an outcome.
Best Used For: Situations where failure has real consequences.
Example: “Timing is critical for this launch to succeed.”
Nuance: Implies necessity, not just general importance.
Synonym Strength: Strong for necessity-driven contexts.
12. Vital
Part of Speech: Adjective
Meaning: Absolutely necessary; essential to life or success.
Best Used For: Emphasizing indispensability.
Example: “Clean water is vital to public health.”
Nuance: Stronger than “important,” implies necessity.
Synonym Strength: Strong for necessity/indispensability.
13. Prominent
Part of Speech: Adjective
Meaning: Important, well-known, or standing out.
Best Used For: People, roles, or visible positions.
Example: “She played a prominent role in the negotiations.”
Nuance: Often implies visibility or public recognition.
Synonym Strength: Strong for people/roles.
14. Remarkable
Part of Speech: Adjective
Meaning: Worthy of attention; striking or extraordinary.
Best Used For: Achievements or unusual outcomes.
Example: “The recovery was remarkable given the circumstances.”
Nuance: Emphasizes being striking, not just important.
Synonym Strength: Moderate; best for striking outcomes.
15. Marked
Part of Speech: Adjective
Meaning: Clearly noticeable; distinct.
Best Used For: Changes, improvements, or differences.
Example: “There was a marked improvement in her performance.”
Nuance: Focuses on clarity of a change rather than its importance.
Synonym Strength: Strong for changes/differences.
16. Pivotal
Part of Speech: Adjective
Meaning: Of crucial importance in relation to development or success.
Best Used For: Turning points or key moments.
Example: “That meeting was pivotal to the company’s direction.”
Nuance: Implies a hinge point, not just general importance.
Synonym Strength: Strong for turning points.
17. Salient
Part of Speech: Adjective
Meaning: Most noticeable or important; prominent.
Best Used For: Highlighting key points in an argument or summary.
Example: “Let’s focus on the salient points of the proposal.”
Nuance: Formal and precise, common in analysis.
Synonym Strength: Strong for key points/summaries.
18. Telling
Part of Speech: Adjective
Meaning: Revealing or indicative of something important, often unintentionally.
Best Used For: Details or reactions that reveal deeper truth.
Example: “His silence was telling.”
Nuance: Leans into the meaningful/suggestive sense.
Synonym Strength: Strong for the suggestive sense.
19. Sizable
Part of Speech: Adjective
Meaning: Fairly large in size or amount.
Best Used For: Quantities or measurable amounts.
Example: “They made a sizable donation to the fund.”
Nuance: Understated compared to more dramatic synonyms.
Synonym Strength: Moderate; softer emphasis on amount.
20. Appreciable
Part of Speech: Adjective
Meaning: Large enough to be noticed or measured.
Best Used For: Formal descriptions of measurable change.
Example: “There was an appreciable drop in temperature overnight.”
Nuance: Formal and precise, common in scientific writing.
Synonym Strength: Strong for measurable/scientific contexts.
| # | Synonym | Sense | Example |
|---|---|---|---|
| 21 | Key | Importance | Trust is a key factor in any partnership. |
| 22 | Central | Importance | Honesty is central to the company’s values. |
| 23 | Essential | Importance | Sleep is essential for good health. |
| 24 | Crucial | Importance | The next few days will be crucial for recovery. |
| 25 | Influential | Importance | She was an influential figure in the movement. |
| 26 | Landmark | Historic | The court issued a landmark decision today. |
| 27 | Historic | Historic | It was a historic moment for the nation. |
| 28 | Groundbreaking | Historic | The study’s findings were groundbreaking. |
| 29 | Game-changing | Informal | The new software update was truly game-changing. |
| 30 | Substantive | Formal | They finally made substantive progress on the deal. |
| 31 | Distinct | Degree | There was a distinct improvement in air quality. |
| 32 | Ample | Degree | The report provides ample evidence for the claim. |
| 33 | Extensive | Degree | The renovation caused extensive changes to the layout. |
| 34 | Perceptible | Degree | There was a perceptible shift in public opinion. |
| 35 | Discernible | Degree | No discernible difference was found between the samples. |
| 36 | Palpable | Degree (figurative) | The tension in the room was palpable. |
| 37 | Non-trivial | Technical/Informal | The error introduced a non-trivial amount of bias. |
| 38 | Newsworthy | Importance/Media | The scandal was deemed newsworthy by every outlet. |
| 39 | Epoch-making | Formal | Historians called it an epoch-making invention. |
| 40 | Far-reaching | Importance | The policy will have far-reaching consequences. |
| 41 | Impactful | Informal | It was one of the most impactful talks at the conference. |
| 42 | Revealing | Meaningful | His answer was more revealing than he intended. |
| 43 | Suggestive | Meaningful | She gave a suggestive nod toward the door. |
| 44 | Pointed | Meaningful | He made a pointed comment about the delay. |
| 45 | Loaded | Meaningful (informal) | That’s a pretty loaded question to ask right now. |
| 46 | Knowing | Meaningful | They exchanged a knowing look across the room. |
| 47 | Eloquent | Meaningful (figurative) | Her silence was more eloquent than any speech. |
| 48 | Statistically significant | Technical | The results were statistically significant at p < 0.05. |
| 49 | Robust | Technical | The study’s findings proved remarkably robust. |
| 50 | Valid | Technical | The test produced a statistically valid result. |
| 51 | Material | Formal/Legal | The contract omitted a material fact. |
| 52 | Relevant | General | Only relevant details were included in the summary. |
| 53 | Germane | Formal | His comments weren’t germane to the discussion. |
| 54 | Signal | Formal/Literary | It was a signal achievement for the young scientist. |
| 55 | Portentous | Formal/Literary | A portentous silence fell over the courtroom. |
| 56 | Grave | General (serious) | They discussed the grave implications of the decision. |
| 57 | Serious | General | This raises a serious concern about safety. |
| 58 | Big | Informal | This is a really big deal for the whole team. |
| 59 | Huge | Informal | Landing that client was huge for the company. |
| 60 | Massive | Informal | It was a massive development in the case. |
| 61 | Big-time | Informal/Slang | This changes things big-time for the launch. |
| 62 | Noticeable | Degree | There was a noticeable change in her tone. |
| 63 | High-stakes | Importance (informal) | It was a high-stakes decision for the whole department. |
| 64 | Defining | Importance | That trip became a defining moment in her career. |
| 65 | Formative | Importance | Those were formative years for the young company. |
Closest, Contextual & Related Alternatives
| Closest Match | Context-Specific | Loosely Related |
|---|---|---|
| 1. Important | 1. Statistically significant (data) | 1. Relevant |
| 2. Considerable | 2. Landmark (historic events) | 2. Serious |
| 3. Substantial | 3. Telling (suggestive) | 3. Notable |
| 4. Notable | 4. Pivotal (turning points) | 4. Weighty |
| 5. Momentous | 5. Palpable (tension/feeling) | 5. Critical |
Synonyms by Intensity
| Intensity | Words |
|---|---|
| Mild | Notable, Noticeable, Discernible, Appreciable |
| Moderate | Important, Considerable, Substantial, Relevant |
| Strong | Critical, Vital, Pivotal, Consequential |
| Extreme | Momentous, Historic, Epoch-making, Landmark |
Formal vs Informal
| Formal | Informal |
|---|---|
| Substantial | Big |
| Consequential | Huge |
| Germane | Game-changing |
| Appreciable | Big-time |
| Salient | Impactful |
Significant vs Important
“Important” is the broader, more common word, while “significant” more often implies measurable weight, statistical relevance, or hidden meaning someone can be important without every action being significant.
Significant vs Considerable
“Considerable” leans specifically toward amount or degree, while “significant” can describe importance, meaning, or degree depending on context.
Significant vs Notable
“Notable” emphasizes standing out or being worth mentioning, while “significant” more strongly implies real consequence or measurable weight.
Significant vs Telling
“Telling” leans entirely into the suggestive, revealing sense of “significant” a telling detail hints at something deeper, without necessarily being large or statistically meaningful.
Words Related But Not Exact Synonyms
- Significance — the noun form describing the quality of being significant, not a synonym itself.
- Relevance — being related or applicable to a matter, which is narrower than general importance.
- Priority — something treated as important enough to act on first, not a description of significance itself.
- Impact — the effect something significant produces, not the quality of being significant.
- Insignificant — the direct antonym, describing something lacking importance or size.
Words Related
Important, Notable, Considerable, Substantial, Momentous, Meaningful, Consequential, Noteworthy, Critical, Vital, Pivotal, Telling
Common Collocations
Significant increase, significant impact, significant other, statistically significant, significant progress, significant role, significant difference, significant amount, deeply significant, historically significant.
Antonyms
| Antonym | Meaning |
|---|---|
| Insignificant | Lacking importance or value |
| Trivial | Of little importance or value |
| Negligible | Too small or unimportant to matter |
| Minor | Of lesser importance or size |
| Inconsequential | Having no real effect or importance |
How to Choose the Right Synonym
Start with which sense of “significant” you actually mean. For general importance, “important,” “crucial,” or “vital” work well. For measurable amounts, “considerable,” “substantial,” or “appreciable” are more precise. For statistical or technical writing, stick with “statistically significant,” “robust,” or “valid” rather than a vague synonym. And for the suggestive, meaningful sense a look, a pause, a remark “telling,” “loaded,” or “knowing” capture that hidden implication that plain importance doesn’t.
Common Mistakes
Using “significant” as a vague stand-in for “big” or “important” in scientific or data writing, when the word has a specific statistical meaning there. Confusing “considerable” (amount) with “significant” (importance) when the two aren’t always interchangeable. Overusing “momentous” or “historic” for routine developments, which dilutes their impact. Missing the meaningful/suggestive sense of “significant” entirely a “significant look” isn’t about size or statistics at all.
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Frequently Asked Questions
What’s the most neutral synonym for “significant”?
“Important” is the most neutral, everyday substitute for “significant.”
What’s the difference between “significant” and “considerable”?
“Considerable” specifically refers to amount or degree, while “significant” can mean importance, degree, or hidden meaning depending on context.
What does “statistically significant” mean?
It’s a technical term meaning a result is unlikely to have occurred by chance, based on statistical analysis.
What’s a synonym for “significant” in a suggestive or implied sense?
“Telling,” “loaded,” or “knowing” all capture that hidden, suggestive meaning.
What’s a formal synonym for “significant”?
“Substantial,” “consequential,” or “salient” all read as more formal and precise.
What’s the opposite of “significant”?
“Insignificant,” “trivial,” and “negligible” are all common antonyms.
Conclusion
“Significant” quietly juggles several different jobs importance, measurable degree, statistical validity, and hidden meaning and using it for all of them can blur what you actually mean. With this list of 65 synonyms, sorted by exactly which sense applies, you can say precisely how much something matters, and why.
