Synonyms|1.6kAntonyms|506|Broader|18Narrower|14Related|1.7k
1
advantageous
1
asinine
1
balmy
1
beneficial
1
blithe
1
brainless
1
breezy
1
brisk
1
chirpy
1
clever
1
cockeyed
1
cuckoo
1
daffy
1
daft
1
derisory(reasonable, sensible)
1
dotty
1
ebullient
1
effervescent(adjective, enthusiastic, vivacious)
1
fanciful(adjective, reasonable, sensible, romantic, imaginary)
1
fatuous
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APASmart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/antonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/antonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/antonyms>