Thesaurus

flippant

adjective

Synonyms and Antonyms of FLIPPANT

making light of something usually regarded as serious or sacred <his flippant comment that the poor save on taxes offended many people>
Near Antonyms grave, serious, sober, solemn, somber (or sombre)
Antonyms earnest, sincere

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How to use a word that (literally) drives some people nuts.
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