60 entries under underground topic. ×

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confidential(secret, hidden, spy, clandestine)
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deep(clandestine, undisclosed)
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dissembled(secret, hidden, clandestine, undisclosed)
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dissimulated(clandestine, undisclosed)
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enigmatical(clandestine, undisclosed)
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in ambush(expression, sensitive, clandestine, undisclosed)
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inside(clandestine, undisclosed)
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mystic(clandestine, undisclosed)
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mystical(clandestine, undisclosed)
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out-of-the-way(clandestine, undisclosed)
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retired(clandestine, undisclosed)
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sneak(clandestine, undisclosed, skulking)
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strange(clandestine, undisclosed)
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subterrestrial
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unacknowledged(sensitive, clandestine, undisclosed, sub-rosa)
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under false pretense(expression, idiom, sensitive, clandestine)
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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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unpublished(clandestine, undisclosed)
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APASmart Define. (2015). under wraps thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/under_wraps/thesaurus/synonyms
ChicagoSmart Define. 2015. "under wraps thesaurus" https://smartdefine.org/under_wraps/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, under wraps thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/under_wraps/thesaurus/synonyms>.
MLASmart Define. "under wraps thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/under_wraps/thesaurus/synonyms>