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treacherous(mean, smooth, cunning, sly)
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unscrupulous(mean, smooth, dishonest, cunning, deceitful)
<123>
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APASmart Define. (2015). covert thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/covert/thesaurus/synonyms
ChicagoSmart Define. 2015. "covert thesaurus" https://smartdefine.org/covert/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, covert thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/covert/thesaurus/synonyms>.
MLASmart Define. "covert thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/covert/thesaurus/synonyms>