Synonyms|418Antonyms|8|Broader|0Narrower|0Related|44

202 entries under adjective topic. ×

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reserved(taciturn, uncommunicative)
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resistant(experimental, subversive)
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resistive(experimental, subversive)
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restricted
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reticent(deep, unpublished)
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retired(deep, isolated, reclusive, uncompanionable)
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revolutionary(experimental, subversive)
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scheming(secretive, conspiratorial)
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secondary(cover, obscure, dark, equivocal)
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shadowy(obscure, dark, unseen)
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shady(dishonest, deceitful)
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shifty(secretive, conspiratorial)
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silent(taciturn, uncommunicative)
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slinking(secretive, sub-rosa, conspiratorial, inching)
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slinky
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slippery(dishonest, deceitful)
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sly
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sneak
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sneaky(sly, fraudulent)
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spy(secret, covert, undercover)
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APASmart Define. (2015). under cover thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/under_cover/thesaurus/synonyms
ChicagoSmart Define. 2015. "under cover thesaurus" https://smartdefine.org/under_cover/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, under cover thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/under_cover/thesaurus/synonyms>.
MLASmart Define. "under cover thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/under_cover/thesaurus/synonyms>