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6
insidious(adjective, sneaky)
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APASmart Define. (2016). sincere thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sincere/thesaurus/antonyms
ChicagoSmart Define. 2016. "sincere thesaurus" https://smartdefine.org/sincere/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, sincere thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sincere/thesaurus/antonyms>.
MLASmart Define. "sincere thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/sincere/thesaurus/antonyms>