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1
unserious(adjective, false, sober, insincere)
For more, visit Sincere on Power Thesaurus
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APASmart Define. (2016). sincere thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/sincere/thesaurus/antonyms
ChicagoSmart Define. 2016. "sincere thesaurus" https://smartdefine.org/sincere/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2016, sincere thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/sincere/thesaurus/antonyms>.
MLASmart Define. "sincere thesaurus" 31 March 2016. Web. 1 October 2026. <https://smartdefine.org/sincere/thesaurus/antonyms>