60 entries under undisclosed topic. ×
| occult(obscure, unknown, clandestine, underground) | |
| restricted(clandestine, underground) | |
| sly(clandestine, underground) | |
| sneak(clandestine, underground) | |
| sneaky(clandestine, underground) | |
| 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) | |
| under wraps(expression, clandestine, underground) | |
| undercover(clandestine, underground) | |
| underground(obscure, unknown, clandestine, unrevealed) | |
| underhanded(clandestine, underground) | |
| unintelligible(obscure, deep, unknown, clandestine, underground) | |
| unrevealed(obscure, unknown, isolated, clandestine, underground) | |
| veiled(obscure, unknown, clandestine, underground) |
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| APA | Smart Define. (2015). retired thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/retired/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "retired thesaurus" https://smartdefine.org/retired/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, retired thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/retired/thesaurus/synonyms>. |
| MLA | Smart Define. "retired thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/retired/thesaurus/synonyms> |