56 entries under undisclosed topic. ×
| stealthy(clandestine, underground) | |
| sub-rosa(clandestine, underground) | |
| surreptitious(clandestine, underground) | |
| top-secret(clandestine, underground) | |
| top secret(expression, clandestine, underground) | |
| unacknowledged(clandestine, underground) | |
| under-the-table(clandestine, underground) | |
| under false pretense(expression, idiom, clandestine, underground) | |
| undercover(clandestine, underground) | |
| underground(obscure, unknown, clandestine, unrevealed) | |
| underhanded(adjective, false, misleading, clandestine, underground) | |
| unenlightened(obscure, deep, unknown, clandestine, underground) | |
| unfrequented(obscure, deep, unknown, clandestine, underground) | |
| unpublished(obscure, deep, unknown, clandestine, underground) | |
| unrevealed(obscure, unknown, clandestine, underground) | |
| unseen(obscure, unknown, clandestine, underground) |
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| APA | Smart Define. (2016). ambiguous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/ambiguous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "ambiguous thesaurus" https://smartdefine.org/ambiguous/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, ambiguous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/ambiguous/thesaurus/synonyms>. |
| MLA | Smart Define. "ambiguous thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/ambiguous/thesaurus/synonyms> |