weighty

Definitions

Having great weight; heavy.

Of great importance or consequence; serious.

Influential or powerful.

Examples

The committee had the weighty responsibility of deciding the future of the organization.

He offered a weighty argument that forced everyone to reconsider their initial positions.

The professor delivered a weighty lecture on the complexities of international law.

Synonyms

heavy burdensome significant important serious grave momentous

Antonyms

light trivial insignificant frivolous unimportant minor trifling