Synonyms|936Antonyms|350|Broader|17Narrower|2Related|1.6k
1
no-nonsense
1
overserious
1
principal
1
prominent
1
real
1
relevant
1
significant
1
sincere
1
sobering
1
solid
1
somber
1
substantial
1
unexcited(light, happy)
1
upper
1
worthwhile
0
austere
0
decisive
0
heavy
0
applicable
0
dignified
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APASmart Define. (2015). frivolous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/frivolous/thesaurus/antonyms
ChicagoSmart Define. 2015. "frivolous thesaurus" https://smartdefine.org/frivolous/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2015, frivolous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/frivolous/thesaurus/antonyms>.
MLASmart Define. "frivolous thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/frivolous/thesaurus/antonyms>