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treacherous
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tricky
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underhand
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underhanded
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wily
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on the sly
<12>
10 years ago|577 views|share |citing 
APASmart Define. (2016). sly thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/sly/thesaurus/narrower
ChicagoSmart Define. 2016. "sly thesaurus" https://smartdefine.org/sly/thesaurus/narrower (accessed September 21, 2026).
HarvardSmart Define 2016, sly thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/sly/thesaurus/narrower>.
MLASmart Define. "sly thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/sly/thesaurus/narrower>