serious

Definitions

Acting or speaking with sincerity and gravity rather than in a joking or lighthearted manner.

Requiring careful consideration or application; of great importance or consequence.

Involving potential danger, harm, or significant negative consequences.

Examples

The doctor told him that his condition was very serious.

She is a serious student who spends hours studying in the library every day.

Synonyms

grave solemn earnest somber thoughtful staid sedate

Antonyms

frivolous playful lighthearted jocular facetious flippant cheerful