70 entries under underground topic. ×

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underhanded(clandestine, undisclosed)
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undisclosed(obscure, unknown, clandestine, unrevealed)
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unenlightened(obscure, unknown, clandestine, undisclosed)
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unfrequented(obscure, unknown, clandestine, undisclosed)
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unintelligible(obscure, unknown, clandestine, undisclosed)
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unknown(obscure, clandestine, undisclosed, unrevealed)
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unpublished(obscure, unknown, clandestine, undisclosed)
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unrevealed(obscure, unknown, clandestine, undisclosed)
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unseen(obscure, unknown, clandestine, undisclosed)
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veiled(obscure, unknown, clandestine, undisclosed)
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APASmart Define. (2015). cloak-and-dagger thesaurus. Retrieved September 30, 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 30, 2026).
HarvardSmart Define 2015, cloak-and-dagger thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms>.
MLASmart Define. "cloak-and-dagger thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/cloak-and-dagger/thesaurus/synonyms>