65 entries under underground topic. ×
| dissimulated(clandestine, undisclosed) | |
| in ambush(expression, clandestine, undisclosed) | |
| inside(personal, clandestine, undisclosed, confidential) | |
| mystic(obscure, unknown, clandestine, undisclosed) | |
| mystical(obscure, unknown, clandestine, undisclosed) | |
| occult(obscure, unknown, clandestine, undisclosed) | |
| on the QT(expression, idiom, obscure, unknown, clandestine) | |
| restricted(clandestine, undisclosed) | |
| sly(clandestine, undisclosed) | |
| sneak(clandestine, undisclosed) | |
| sneaky(clandestine, undisclosed) | |
| stealthy(clandestine, undisclosed) | |
| sub-rosa(clandestine, undisclosed) | |
| surreptitious(clandestine, undisclosed) | |
| top-secret(clandestine, undisclosed) | |
| top secret(expression, clandestine, undisclosed) | |
| unacknowledged(clandestine, undisclosed) | |
| under-the-table(clandestine, undisclosed) | |
| under false pretense(expression, idiom, clandestine, undisclosed) | |
| under wraps(expression, clandestine, undisclosed) |
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| APA | Smart Define. (2015). retired thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/retired/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "retired thesaurus" https://smartdefine.org/retired/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, retired thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/retired/thesaurus/synonyms>. |
| MLA | Smart Define. "retired thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/retired/thesaurus/synonyms> |