50 entries under underground topic. ×
| sub-rosa(clandestine, undisclosed) | |
| surreptitious(secret, hidden, clandestine, concealed) | |
| backdoor(obscure, clandestine, undisclosed, unrevealed) | |
| backstairs(clandestine, undisclosed) | |
| camouflaged(obscure, clandestine, undisclosed, unrevealed) | |
| classified(obscure, clandestine, undisclosed, unrevealed) | |
| cloak-and-dagger(obscure, clandestine, undisclosed, unrevealed) | |
| closet(obscure, clandestine, undisclosed, unrevealed) | |
| confidential(clandestine, undisclosed) | |
| conspiratorial(obscure, clandestine, undisclosed, unrevealed) | |
| discreet(clandestine, undisclosed) | |
| dissembled(clandestine, undisclosed) | |
| dissimulated(clandestine, undisclosed) | |
| hush-hush(clandestine, undisclosed) | |
| in ambush(expression, clandestine, undisclosed) | |
| inside(clandestine, undisclosed) | |
| on the QT(expression, idiom, obscure, clandestine) | |
| restricted(clandestine, undisclosed) | |
| sly(clandestine, undisclosed) | |
| sneak(clandestine, undisclosed) |
For more, visit
Unknown on
Power Thesaurus
| APA | Smart Define. (2015). unknown thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unknown/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unknown thesaurus" https://smartdefine.org/unknown/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unknown thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unknown/thesaurus/synonyms>. |
| MLA | Smart Define. "unknown thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/unknown/thesaurus/synonyms> |