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 brought hope to the entire nation.

She made the momentous decision to leave her corporate job and pursue a career in fine arts.

Historians often look back at the invention of the printing press as a momentous turning point for human knowledge.

Synonyms

consequential significant pivotal historic crucial important fateful

Antonyms

trivial insignificant unimportant inconsequential minor negligible trifling