Frivolous Thesaurus / Antonyms

34	serious
15	solemn(adjective, quiet, serious)
11	mature
9	clever
7	grave(adjective, light, sensible, gloomy, lively)
7	thoughtful
7	sensible
5	earnest
5	staid(adjective, set, restrained, indecorous)
5	material
5	sober(upset, light)
5	titanic
5	critical
5	supportive
4	sedate(loud, indecorous)
4	wise
4	consequential
4	important
4	shrewd
3	severe

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APA	Smart Define. (2015). frivolous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/frivolous/thesaurus/antonyms
Chicago	Smart Define. 2015. "frivolous thesaurus" https://smartdefine.org/frivolous/thesaurus/antonyms (accessed September 26, 2026).
Harvard	Smart Define 2015, frivolous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/frivolous/thesaurus/antonyms>.
MLA	Smart Define. "frivolous thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/frivolous/thesaurus/antonyms>

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