55 entries under underground topic. ×
| backdoor(obscure, unknown, clandestine, undisclosed) | |
| backstairs(clandestine, undisclosed) | |
| camouflaged(obscure, unknown, clandestine, undisclosed) | |
| classified(obscure, unknown, clandestine, undisclosed) | |
| closet(obscure, unknown, clandestine, undisclosed) | |
| conspiratorial(obscure, unknown, clandestine, undisclosed) | |
| discreet(clandestine, undisclosed) | |
| dissembled(clandestine, undisclosed) | |
| dissimulated(clandestine, undisclosed) | |
| furtive(obscure, unknown, clandestine, undisclosed) | |
| hush-hush(clandestine, undisclosed) | |
| in ambush(expression, clandestine, undisclosed) | |
| incognito(clandestine, undisclosed) | |
| inside(clandestine, undisclosed) | |
| on the QT(expression, idiom, obscure, unknown, clandestine) | |
| out-of-the-way(obscure, complex, unknown, clandestine) | |
| restricted(clandestine, undisclosed) | |
| reticent(obscure, unknown, clandestine, undisclosed) | |
| retired(obscure, unknown, clandestine, undisclosed) | |
| sly(clandestine, undisclosed) |
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| APA | Smart Define. (2015). mystic thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/mystic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mystic thesaurus" https://smartdefine.org/mystic/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, mystic thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/mystic/thesaurus/synonyms>. |
| MLA | Smart Define. "mystic thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/mystic/thesaurus/synonyms> |