53 entries under undisclosed topic. ×
| obscure(clandestine, underground) | |
| recondite(clandestine, underground) | |
| strange(clandestine, underground) | |
| top-secret(secret, clandestine, underground, classified) | |
| unacknowledged(clandestine, underground) | |
| under false pretense(expression, idiom, clandestine, underground) | |
| underground(secret, hidden, spy, clandestine) | |
| unenlightened(clandestine, underground) | |
| unintelligible(clandestine, underground) | |
| unknown(clandestine, underground) | |
| unrevealed(clandestine, underground, sealed) | |
| unseen(clandestine, underground) | |
| veiled(clandestine, underground) |
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| APA | Smart Define. (2015). confidential thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/confidential/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "confidential thesaurus" https://smartdefine.org/confidential/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2015, confidential thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/confidential/thesaurus/synonyms>. |
| MLA | Smart Define. "confidential thesaurus" 10 April 2015. Web. 1 October 2026. <https://smartdefine.org/confidential/thesaurus/synonyms> |