Synonyms for Significant

Updated 2026-10-12 · Synonyms List editorial team

Quick answer: Looking for synonyms for significant? This list provides words that convey importance, size, or meaning. You will find formal and informal options, along with examples to help you choose the perfect term for your specific context and tone.

Closest Synonyms for Significant

important: This word implies value or consequence. The important decision shaped the company’s future.
notable: Used for things that attract attention. She made a notable contribution to the field.
substantial: Refers to size or quantity. There was a substantial increase in sales this quarter.
considerable: Indicates a large amount. He has considerable experience in architecture.
meaningful: Suggests emotional or practical worth. It was a meaningful conversation between friends.
noteworthy: Highlights something worth recording. The event was noteworthy for its historical value.
weighty: Implies heaviness in responsibility or gravity. The judge delivered a weighty verdict.
momentous: Describes events of great importance. We are witnessing a momentous change.
appreciable: Means large enough to be noticed. The temperature drop was appreciable.
serious: Often used for matters requiring attention. This is a serious matter we must address.
heavy: Suggests a burden or large impact. The report carried a heavy tone.
major: Indicates primary or large scale status. This is a major milestone for the project.

Formal Synonyms for Significant

impressive: Conveys admiration or high quality. The results were truly impressive.
pertinent: Relevant to the matter at hand. These details are pertinent to the case.
prominent: Stands out in a group. He is a prominent figure in politics.
salient: Highlights the most important features. The salient point was the cost.
consequential: Has important results or influence. A consequential error was made.
material: Relevant or important to success. Factors material to the argument were listed.
paramount: Indicates the highest priority. Safety is of paramount importance.
crucial: Vital for success or failure. It is crucial to finish on time.
grave: Serious and often solemn. We face a grave situation.

Informal Synonyms for Significant

big: Simple and common for size or amount. It was a big deal.
key: Essential for success. It’s the key to unlocking the door.
huge: Very large in scale. We made huge profits.
critical: Vital or essential in a casual way. This is critical for us.
big-time: Slang for very important or professional. She is a big-time star.
pivotal: Describes a point on which something turns, such as a pivotal moment in the game.
profound: Indicates deep impact or meaning, like a profound effect on the community.

Antonyms for Significant

insignificant
trivial
minor
negligible
trifling
inconsequential
unimportant
insubstantial
petty
insignificancy

How to Pick the Right Synonym

Choose a synonym based on the context of your sentence and the tone you wish to convey. If you are writing a formal report, select words like crucial or paramount. For casual conversation, big or key works better. Consider the degree of importance; use stronger words like momentous for historical events and weaker words like notable for everyday occurrences. Always check if the synonym fits the specific nuance you need, such as size versus emotional weight.

Frequently Asked Questions

What is a good synonym for significant?

Good synonyms for significant include important, notable, major, and substantial. The best choice depends on the context. For formal writing, use words like crucial or paramount. For casual speech, big or key might be better.

What is the difference between significant and important?

Important is a general term for value or consequence. Significant often implies measurable impact or statistical weight. Use important for general worth and significant when something stands out or has a clear effect.

Can significant be used as an adjective or noun?

Yes, significant functions primarily as an adjective to describe nouns. You can say a significant change occurred. It is rarely used as a noun, though the noun form significance exists to mean the quality of being significant.

What are some formal synonyms for significant?

Formal synonyms include paramount, salient, crucial, and consequential. These words suit academic or professional writing. They convey high levels of importance or gravity without sounding overly casual or vague.