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.

It was momentous for Franzmann, though the real acclaim came decades later.

From BBC • Jun. 1, 2026

“Kevin Warsh’s confirmation as the next Federal Reserve Chairman is a momentous step towards finally restoring accountability, competence, and confidence in Fed decision-making,” White House spokesman Kush Desai told Barron’s.

From Barron's • May 22, 2026

“Choo Choo Revue,” the latest in a long line of song-and-dance productions, is arriving at a momentous time for the Bob Baker Marionette Theater.

From Los Angeles Times • May 20, 2026

She made similarly momentous visits to Los Angeles and Inyo counties.

From Los Angeles Times • May 18, 2026

While I was entertaining these trivial thoughts, a momentous and terrible event was unfolding close by.

From "Ophelia" by Lisa Klein

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!