momentous

[moh-men-tuhs] / moʊˈmɛn təs /

ADJECTIVE

important; serious

Synonyms

STRONGEST

consequential crucial decisive eventful far-reaching fateful historic meaningful memorable notable pivotal significant weighty

WEAK

big chips are down considerable critical earth-shaking earth-shattering epochal grave heavy heavy number material of moment outstanding substantial vital

Antonyms

STRONGEST

inconsequential insignificant meaningless ordinary trivial uneventful unimportant unnoteworthy unremarkable unsubstantial

WEAK

immaterial trifling

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Closing off a momentous week for both companies, CoreWeave and Anthropic announced a multi-year compute agreement on Friday that’s scheduled to go online later this year.

From MarketWatch • Apr. 10, 2026

Biographers such as Ms. Riskin frequently claim their subjects are more momentous than they were.

From The Wall Street Journal • Mar. 20, 2026

Does Townsend have many big calls to make for such a momentous game?

From BBC • Mar. 10, 2026

In 2017, he became an American citizen, arriving at that momentous decision while walking in a Westwood cemetery.

From Los Angeles Times • Mar. 7, 2026

Though everyone could see that the former president was noticeably thinner—he had lost fifty-five pounds on the expedition—they had no idea how momentous it was that Roosevelt was even alive.

From "Death on the River of Doubt" by Samantha Seiple

Vocabulary lists containing momentous

The SAT: Words to Capture Tone, List 3

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The New SAT: Words to Capture Tone

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

100 SAT Words Beginning with "M"

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!