70 entries under underground topic. ×

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backdoor(obscure, unknown, clandestine, undisclosed)
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backstairs(clandestine, undisclosed)
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camouflaged(obscure, unknown, clandestine, undisclosed)
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classified(obscure, secret, unknown, clandestine)
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close(obscure, unknown, clandestine, undisclosed)
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clouded(obscure, unknown, clandestine, undisclosed)
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confidential(secret, clandestine, undisclosed, top-secret)
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conspiratorial(obscure, unknown, clandestine, undisclosed)
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covered(obscure, unknown, clandestine, undisclosed)
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cryptic(obscure, unknown, clandestine, undisclosed)
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deep(obscure, unknown, clandestine, undisclosed)
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discreet(clandestine, undisclosed)
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disguised(clandestine, undisclosed)
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dissembled(clandestine, undisclosed)
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dissimulated(clandestine, undisclosed)
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enigmatical(obscure, unknown, clandestine, undisclosed)
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esoteric(obscure, unknown, clandestine, undisclosed)
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in ambush(expression, clandestine, undisclosed)
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incognito(clandestine, undisclosed)
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inside(clandestine, undisclosed)
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APASmart Define. (2015). cloak-and-dagger thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms
ChicagoSmart Define. 2015. "cloak-and-dagger thesaurus" https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, cloak-and-dagger thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms>.
MLASmart Define. "cloak-and-dagger thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms>