Synonyms|145Antonyms|37|Broader|4Narrower|0Related|81
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perfidiously
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reticently
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steal
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stealth
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sub sigillo
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subtle
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swipe
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thieving
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traitorously
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treacherously
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tricky
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under cover(expression, clandestine, underhandedly)
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under wraps(expression, clandestine, secretly, underhandedly, surreptitiously)
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undercover(clandestine, secretly, underhandedly, surreptitiously)
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underground
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unfairly
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untruthfully
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usefully
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waggishly
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wildcat(clandestine, secretly, underhandedly, surreptitiously)
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APASmart Define. (2015). slyly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/slyly/thesaurus/synonyms
ChicagoSmart Define. 2015. "slyly thesaurus" https://smartdefine.org/slyly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, slyly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/slyly/thesaurus/synonyms>.
MLASmart Define. "slyly thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/slyly/thesaurus/synonyms>