54 entries under underground topic. ×
| surreptitious(adjective, secret, unknown, hidden) | |
| top-secret(clandestine, undisclosed) | |
| top secret(expression, clandestine, undisclosed) | |
| under wraps(expression, clandestine, undisclosed) | |
| enigmatical(obscure, strange, supernatural, unknown, spiritual) | |
| incognito(adverb, clandestine, undisclosed) | |
| secretive(strange, clandestine, undisclosed, inexplicable) | |
| backdoor(obscure, unknown, clandestine, undisclosed) | |
| camouflaged(obscure, unknown, clandestine, undisclosed) | |
| cloak-and-dagger(obscure, unknown, clandestine, undisclosed) | |
| closet(obscure, unknown, clandestine, undisclosed) | |
| conspiratorial(obscure, unknown, clandestine, undisclosed) | |
| discreet(clandestine, undisclosed) | |
| dissembled(clandestine, undisclosed) | |
| dissimulated(clandestine, undisclosed) | |
| in ambush(expression, clandestine, undisclosed) | |
| inside(clandestine, undisclosed) | |
| on the QT(expression, idiom, obscure, unknown, clandestine) | |
| out-of-the-way(obscure, complex, unknown, clandestine) | |
| reticent(obscure, unknown, clandestine, undisclosed) |
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| APA | Smart Define. (2015). occult thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/occult/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "occult thesaurus" https://smartdefine.org/occult/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, occult thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/occult/thesaurus/synonyms>. |
| MLA | Smart Define. "occult thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/occult/thesaurus/synonyms> |