51 entries under underground topic. ×

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closet(adjective, clandestine, undisclosed)
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ambiguous(clandestine, undisclosed)
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cloak-and-dagger(clandestine, undisclosed)
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clouded(clandestine, undisclosed)
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deep(clandestine, undisclosed)
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out-of-the-way(clandestine, undisclosed)
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top-secret(clandestine, undisclosed)
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unenlightened(clandestine, undisclosed)
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unfrequented(clandestine, undisclosed)
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unintelligible(clandestine, undisclosed)
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unrevealed(unknowing, clandestine, undisclosed, hermetical)
<123>
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APASmart Define. (2015). secretive thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/secretive/thesaurus/synonyms
ChicagoSmart Define. 2015. "secretive thesaurus" https://smartdefine.org/secretive/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, secretive thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/secretive/thesaurus/synonyms>.
MLASmart Define. "secretive thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/secretive/thesaurus/synonyms>