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

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of momentous Still, that’s a pretty momentous thing to show on screen for this character. — Dalton Ross, Entertainment Weekly, 17 Aug. 2026 White House officials said the orders would prevent a large number of children from receiving birthright citizenship, hailing it as momentous. — Kevin Rector, Los Angeles Times, 7 Aug. 2026 So Flight 14 could be momentous, provided SpaceX gets permission from regulators to make an attempt. — Mike Wall, Space.com, 4 Aug. 2026 And this being France’s national flag carrier, meal time is its own momentous event. — Jessica Puckett, Condé Nast Traveler, 1 Aug. 2026 See All Example Sentences for momentous

Recent Examples of Synonyms for momentous

Adjective

The whipsawing legal battle could have major ramifications for the midterms.

— Lindsay Whitehurst, Chicago Tribune, 29 Aug. 2026
Businesses considering major investments pay close attention to regulatory risk.

— Robin Rossenfeld, Denver Post, 28 Aug. 2026

Definition of major

Adjective

That has changed quietly, with robots now performing important roles in operating rooms, hospital wards, rehabilitation centers, and corridors around the world.

— Atharva Gosavi, Interesting Engineering, 30 Aug. 2026
Reseeding is particularly important in high-traffic areas or patches of the lawn where grubs, heat, or disease have left the turf thin.

— Mary Marlowe Leverette, The Spruce, 29 Aug. 2026

Definition of important

Adjective

Claiming the 29-year-old Robert would require a more significant financial commitment than Sewald.

— Mitch Bannon, New York Times, 31 Aug. 2026
The advanced weapon features AV’s 20kW-class LOCUST LWS integrated on the General Motors Defense Infantry Squad Vehicle (ISV) platform–a significant advancement in mobile, frontline C-UAS capabilities.

— Prabhat Ranjan Mishra, Interesting Engineering, 30 Aug. 2026

Definition of significant

Adjective

The Permanent Court of Arbitration (PCA) in the Hague on Monday ruled in Pakistan's favor over the 1960 Indus Water Treaty, saying the historic pact remains fully binding and that India had no valid grounds for ending or suspending it.

— Anniek Bao, CNBC, 2 Sep. 2026
This design is directly inspired by a historic Leroy tact watch created in 1810, today preserved at the Patek Philippe Museum.

— Carol Besler, Robb Report, 2 Sep. 2026