| conspiratorial(clandestine, underground, undisclosed) | |
| covered(secret, hidden, clandestine, underground, undisclosed) | |
| creep(secret, hidden, spy, covert) | |
| curious | |
| curtain | |
| darkly | |
| deep(clandestine, underground, undisclosed) | |
| detached | |
| enigmatical(clandestine, underground, undisclosed) | |
| esoteric(clandestine, underground, undisclosed) | |
| extraneous | |
| faceless | |
| foreigner | |
| hole-and-corner(secret, hidden, spy, covert) | |
| huggermugger(adjective, secret) | |
| in holes and corners(expression, idiom, furtively) | |
| inactive | |
| indefinite(strange, unidentified) | |
| intelligence(secret, hidden, spy, covert) | |
| irregular |
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| APA | Smart Define. (2015). incognito thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/incognito/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "incognito thesaurus" https://smartdefine.org/incognito/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, incognito thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/incognito/thesaurus/synonyms>. |
| MLA | Smart Define. "incognito thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/incognito/thesaurus/synonyms> |