Momentous

Definitions

Of great importance or significance, especially in its bearing on the future.

Having serious or far-reaching consequences.

Examples

The signing of the peace treaty was a momentous occasion that changed the course of history.

She made the momentous decision to leave her job and pursue her lifelong dream of traveling the world.

Synonyms

Significant Important Consequential Historic Crucial Pivotal Weighty

Antonyms

Trivial Insignificant Unimportant Inconsequential Minor Negligible Trifling