58 entries under underground topic. ×
| sneak(close, restricted, clandestine, discreet) | |
| sneaky(clandestine, undisclosed) | |
| stealthy(secret, hidden, spy, clandestine) | |
| strange(adjective, new, remote, indefinite, clandestine) | |
| sub-rosa(close, secret, hidden, spy, clandestine) | |
| surreptitious(secret, hidden, spy, clandestine) | |
| top secret(expression, close, clandestine, undisclosed) | |
| under-the-table(secret, hidden, clandestine, undisclosed) | |
| under false pretense(expression, idiom, close, clandestine) | |
| underhand(secret, hidden, spy, clandestine) | |
| underhanded(secret, hidden, clandestine, undisclosed) | |
| undisclosed(unknown, clandestine, nameless) | |
| unrevealed(strange, new, remote, indefinite, clandestine) | |
| unseen(secret, hidden, clandestine, undisclosed) | |
| veiled(secret, hidden, clandestine, underhanded) | |
| backdoor(close, clandestine, undisclosed, furtive) | |
| abstruse(clandestine, undisclosed) | |
| ambiguous(clandestine, undisclosed) | |
| arcane(clandestine, undisclosed) | |
| classified(clandestine, undisclosed) |
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| APA | Smart Define. (2015). incognito thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/incognito/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "incognito thesaurus" https://smartdefine.org/incognito/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, incognito thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/incognito/thesaurus/synonyms>. |
| MLA | Smart Define. "incognito thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/incognito/thesaurus/synonyms> |