Definitions

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.

Dudamel’s Disney “finale,” however momentous, lacked nearly all the trappings of pomp.

From Los Angeles Times • Jun. 9, 2026

The White House is partnering with Freedom 250 on the fair, part of a "series of once-in-a-generation events for America's momentous anniversary".

From BBC • May 31, 2026

"At first blush, this case may not seem momentous," said Koh from the trade union confederation.

From Barron's • May 21, 2026

During a momentous power struggle in 2017, Sutskever and Brockman proposed giving Musk more than half of OpenAI’s equity.

From The Wall Street Journal • May 18, 2026

July was halfway gone when she made her momentous decision.

From "Lyddie" by Katherine Paterson

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!