70 entries under clandestine topic. ×
| unacknowledged(underground, undisclosed) | |
| under-the-table(underground, undisclosed) | |
| under false pretense(expression, idiom, underground, undisclosed) | |
| under wraps(expression, underground, undisclosed) | |
| undercover(underground, undisclosed) | |
| underground(obscure, unknown, undisclosed, unrevealed) | |
| underhanded(underground, undisclosed) | |
| unintelligible(obscure, deep, unknown, underground) | |
| unseen(obscure, unknown, underground, undisclosed) | |
| veiled(obscure, unknown, underground, undisclosed) |
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| APA | Smart Define. (2015). unpublished thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unpublished/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unpublished thesaurus" https://smartdefine.org/unpublished/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, unpublished thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unpublished/thesaurus/synonyms>. |
| MLA | Smart Define. "unpublished thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unpublished/thesaurus/synonyms> |