Synonyms|110Antonyms|3|Broader|1Narrower|0Related|37
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cop
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cryptic
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cunningly
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doors
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filch
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fraudulent(adjective, secret, private, hidden, sneaky)
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furtive(adjective, secret, private, hidden, sneaky)
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hugger
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huggermugger(adverb, show)
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in private
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mugger
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mysteriously
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off the record
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on the side
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personally
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privy
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rose
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secretive(secret, private, hidden, subversive, dissident)
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secretively
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skulking(adjective, secret, private, hidden, sneaky)
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APASmart Define. (2015). on the sly thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/on_the_sly/thesaurus/synonyms
ChicagoSmart Define. 2015. "on the sly thesaurus" https://smartdefine.org/on_the_sly/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, on the sly thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/on_the_sly/thesaurus/synonyms>.
MLASmart Define. "on the sly thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/on_the_sly/thesaurus/synonyms>