44 entries under underground topic. ×

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backdoor(obscure, unknown, clandestine, undisclosed)
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backstairs(clandestine, undisclosed)
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classified(obscure, unknown, clandestine, undisclosed)
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cloak-and-dagger(obscure, unknown, clandestine, undisclosed)
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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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discreet(clandestine, undisclosed)
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dissimulated(clandestine, undisclosed)
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in ambush(expression, clandestine, undisclosed)
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inside(clandestine, undisclosed)
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out-of-the-way(obscure, unknown, clandestine, undisclosed)
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restricted(clandestine, undisclosed)
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reticent(obscure, unknown, clandestine, undisclosed)
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retired(obscure, unknown, clandestine, undisclosed)
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sub-rosa(secret, private, hidden, sneaky)
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top-secret(clandestine, undisclosed)
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top secret(expression, clandestine, undisclosed)
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unacknowledged(clandestine, undisclosed)
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under false pretense(expression, idiom, clandestine, undisclosed)
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APASmart Define. (2016). veiled thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/veiled/thesaurus/synonyms
ChicagoSmart Define. 2016. "veiled thesaurus" https://smartdefine.org/veiled/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, veiled thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/veiled/thesaurus/synonyms>.
MLASmart Define. "veiled thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/veiled/thesaurus/synonyms>