89 entries under noun topic. ×

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heel(creep, rake, rogue, scoundrel)
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huis clos
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humbug
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hunch
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imp
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impostor
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inkling
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knave
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la derobee
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la sourdine
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louse(creep, rake, rogue, scoundrel)
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lout(creep, rake, rogue, scoundrel)
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misgiving
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mistrust
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on the q.t
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on the side
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or Q.T.
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phantom
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phoniness(informal, insincerity)
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quietly
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APASmart Define. (2016). sly thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/sly/thesaurus/synonyms
ChicagoSmart Define. 2016. "sly thesaurus" https://smartdefine.org/sly/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, sly thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/sly/thesaurus/synonyms>.
MLASmart Define. "sly thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/sly/thesaurus/synonyms>