Synonyms|515Antonyms|130|Broader|2Narrower|0Related|740
8
serious(adjective, somber, humorless)
8
earnest(adjective, cool, cold, important, enthusiastic)
5
respectful
4
courteous
3
reverent
2
sincere(false, insincere)
2
sober(adjective, upset, light, frivolous)
1
solemn
1
somber(light, bright)
1
caring
1
goofy
1
grave
1
pensive
1
severe
1
thoughtful(happy, careless, superficial)
1
weighty
0
anaerobic
0
arrange
0
attend
0
austere
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APASmart Define. (2015). flippant thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/flippant/thesaurus/antonyms
ChicagoSmart Define. 2015. "flippant thesaurus" https://smartdefine.org/flippant/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, flippant thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/flippant/thesaurus/antonyms>.
MLASmart Define. "flippant thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/flippant/thesaurus/antonyms>