60 entries under underground topic. ×
| sneaky(clandestine, undisclosed) | |
| stealthy(adjective, clandestine, undisclosed) | |
| sub-rosa(close, clandestine, undisclosed, furtive) | |
| surreptitious(clandestine, undisclosed) | |
| top secret(expression, close, private, clandestine) | |
| unacknowledged(close, clandestine, undisclosed, furtive) | |
| under-the-table(clandestine, undisclosed) | |
| under false pretense(expression, idiom, close, clandestine) | |
| abstruse(clandestine, undisclosed) | |
| ambiguous(clandestine, undisclosed) | |
| arcane(intimate, secret, private, clandestine) | |
| cloak-and-dagger(clandestine, undisclosed) | |
| clouded(clandestine, undisclosed) | |
| conspiratorial(clandestine, undisclosed) | |
| covered(clandestine, undisclosed) | |
| enigmatical(clandestine, undisclosed) | |
| mystic(clandestine, undisclosed) | |
| mystical(clandestine, undisclosed) | |
| obscure(clandestine, undisclosed) | |
| occult(clandestine, undisclosed) |
For more, visit
Inside on
Power Thesaurus
| APA | Smart Define. (2015). inside thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/inside/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "inside thesaurus" https://smartdefine.org/inside/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, inside thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/inside/thesaurus/synonyms>. |
| MLA | Smart Define. "inside thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/inside/thesaurus/synonyms> |