MOMENTOUS Synonyms: 74 Similar and Opposite Words

momentous

adjective

mō-ˈmen-təs

Definition of momentous

as in major

having great meaning or lasting effect a momentous occasion that will go down in the history books

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Example Sentences

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Recent Examples of momentous But before either the dialogue with Jeffrey Goldberg or the book discussion, some opening thoughts on this memorable and momentous anniversary. — David Frum, The Atlantic, 1 July 2026 Dying was such a momentous thing to do, and while Matthew, their dear friend, their cousin-brother, had been off doing it, the women had occupied themselves with such frivolities as cleaning and heat. — Danielle Parker, CBS News, 30 June 2026 The film will follow 11 stories that occurred in the wake of the momentous coup d’état in Chile on September 11, 1973. — Anna Marie De La Fuente, Variety, 26 June 2026 There are all sorts of celebrations going on to commemorate this momentous occasion, as well as some tasteful product introductions from American brands. — Nancy Olson, Forbes.com, 26 June 2026 See All Example Sentences for momentous

Recent Examples of Synonyms for momentous

Adjective

Apple leveled major allegations against OpenAI and some of its staffers Friday, alleging the ChatGPT maker systematically directed current and former Apple employees to bring secret information over to OpenAI.

— Reed Albergotti, semafor.com, 11 July 2026
The discovery of the buckling columns launched a major effort to shore up — or reinforce — the building’s weakest points, with crews using emergency jacks and installing new steel supports.

— Gloria Pazmino, CNN Money, 11 July 2026

Definition of major

Adjective

One interesting trend is that this tournament will feature some very good tight ends, a position that has become increasingly important in college football and the NFL but not so much in high school football in the era of spread offenses.

— Eric Sondheimer, Los Angeles Times, 5 July 2026
As technology becomes more sophisticated and the number of living survivors continues to decline, preserving authentic testimony becomes even more important.

— Eva Weiss, Sun Sentinel, 5 July 2026

Definition of important

Adjective

That’s reigniting age-old feuds about production quotas that already led the United Arab Emirates, one of OPEC’s most significant members, to leave the group in April.

— David Goldman, CNN Money, 6 July 2026
It is recommended that any batteries in devices that will be stored for significant periods should undergo a maintenance routine to maintain their health by charging them to half capacity every six months.

— Ewan Spence, Forbes.com, 6 July 2026

Definition of significant

Adjective

And in one section, 1,200 cc engines are being assembled for the company’s new superpremium motorbike, the Norton Manx R, one of four new models from the historic British brand now owned by TVS Motor and set to go on sale later this year.

— Anu Raghunathan, Forbes.com, 9 July 2026
New York — The stocks that have fueled Wall Street’s powerful AI rally are suddenly under pressure as investors evaluate rising tensions in the Middle East, take profits after a historic run and reassess where to find value.

— John Towfighi, CNN Money, 9 July 2026