| private(adjective, secret, hidden, clandestine) | |
| under cover(expression, adverb, secret, covert) | |
| clandestine(secret, hidden, underground, undisclosed) | |
| confidential(adjective, secret, restricted, hidden) | |
| furtive(adjective, close, secret, hidden) | |
| undercover(adjective, adverb, informal, secret, hidden) | |
| stealthy(secret, hidden, clandestine, underground) | |
| sub-rosa(close, secret, hidden, clandestine) | |
| surreptitious(secret, hidden, clandestine, underground) | |
| underhand(secret, hidden, clandestine, underground) | |
| creep(secret, hidden, covert) | |
| hole-and-corner(secret, hidden, covert) | |
| intelligence(secret, hidden, covert) | |
| on the QT(expression, idiom, secret, hidden) | |
| stealth(secret, hidden, covert) | |
| underground(secret, hidden, clandestine, undisclosed) | |
| underneath(secret, hidden, covert) |
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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> |