Word Type

Adjective

Adjective

Adverb

The word "serious" can be used as adjective, adjective and adverb.

Word Relationships

Opposites (Antonyms)

frivolous jesting trifling

Derived Terms

ha ha only serious hyperserious jocoserious nonserious overserious self-serious semiserious seriositude serious-minded serious-mindedly serious-mindedness seriously seriousness srs superserious take serious ultraserious unserious why so serious

Etymologically Related To

sweer

Narrower Terms (Hyponyms)

abstinent ascetic ascetical calm humorless

Related Terms

important sullen

Related Terms

grave happiness humor important insignificant weighty

Similar Terms

critical difficult difficult earnest grave hard important important intellectual intellectual of import overserious overserious real real sedate sedate serious minded serious-minded sincere sober sobering sobering solemn solemn solid solid thoughtful

Synonym Network

life threatening unplayful

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.