- Definitions|1
- Thesaurus|1.5k
- Abbreviations|0
63 entries under underground topic. ×
| classified(obscure, unknown, clandestine, undisclosed) | |
| cloak-and-dagger(obscure, unknown, clandestine, undisclosed) | |
| close(obscure, solid, unknown, dense, clandestine) | |
| closet(obscure, unknown, clandestine, undisclosed) | |
| confidential(clandestine, undisclosed) | |
| conspiratorial(obscure, unknown, clandestine, undisclosed) | |
| covered(obscure, unknown, clandestine, undisclosed) | |
| discreet(clandestine, undisclosed) | |
| disguised(obscure, unknown, 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, deep, unknown, clandestine) | |
| private(obscure, unknown, clandestine, undisclosed) | |
| restricted(clandestine, undisclosed) |
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| APA | Smart Define. (2016). unintelligible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unintelligible/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unintelligible thesaurus" https://smartdefine.org/unintelligible/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, unintelligible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unintelligible/thesaurus/synonyms>. |
| MLA | Smart Define. "unintelligible thesaurus" 30 March 2016. Web. 30 September 2026. <https://smartdefine.org/unintelligible/thesaurus/synonyms> |