63 entries under underground topic. ×

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classified(obscure, unknown, clandestine, undisclosed)
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cloak-and-dagger(obscure, unknown, clandestine, undisclosed)
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close(obscure, solid, unknown, dense, clandestine)
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closet(obscure, unknown, clandestine, undisclosed)
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confidential(clandestine, undisclosed)
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conspiratorial(obscure, unknown, clandestine, undisclosed)
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covered(obscure, unknown, clandestine, undisclosed)
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discreet(clandestine, undisclosed)
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disguised(obscure, unknown, clandestine, undisclosed)
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dissembled(clandestine, undisclosed)
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dissimulated(clandestine, undisclosed)
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furtive(obscure, unknown, clandestine, undisclosed)
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hush-hush(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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on the QT(expression, idiom, obscure, unknown, clandestine)
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out-of-the-way(obscure, deep, unknown, clandestine)
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private(obscure, unknown, clandestine, undisclosed)
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restricted(clandestine, undisclosed)
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APASmart Define. (2016). unintelligible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unintelligible/thesaurus/synonyms
ChicagoSmart Define. 2016. "unintelligible thesaurus" https://smartdefine.org/unintelligible/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, unintelligible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unintelligible/thesaurus/synonyms>.
MLASmart Define. "unintelligible thesaurus" 30 March 2016. Web. 30 September 2026. <https://smartdefine.org/unintelligible/thesaurus/synonyms>