- Definitions|2
- Thesaurus|2.2k
- Abbreviations|0
59 entries under underground topic. ×
| recondite(adjective, evil, obscure, difficult, strange) | |
| arcane(adjective, evil, obscure, solid, strange) | |
| mystical(adjective, hard, evil, obscure, strange) | |
| hush-hush(adjective, quiet, separate, reserved, secret) | |
| undercover(adjective, secret, spy, clandestine) | |
| deep(adjective, hard, evil, obscure, complex) | |
| close(adjective, quiet, solid, humble, shy) | |
| restricted(clandestine, undisclosed) | |
| secretive(adjective, quiet, obscure, plain, strange) | |
| discreet(personal, imperceptible, unremarkable, unobtrusive) | |
| out-of-the-way(adjective, close, quiet, separate, shy) | |
| sneaky(adjective, secret, private, clandestine) | |
| unintelligible(adjective, hard, obscure, solid, dark) | |
| unpublished(adjective, clandestine, undisclosed) | |
| ambiguous(adjective, cover, obscure, dark, doubtful) | |
| backstairs(unknowing, clandestine, undisclosed, hermetical) | |
| classified(personal, clandestine, undisclosed, confidential) | |
| cloak-and-dagger(clandestine, fraudulent, undisclosed) | |
| reticent(adjective, quiet, obscure, humble, distant) | |
| retired(adjective, close, quiet, separate, humble) |
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| APA | Smart Define. (2015). hidden thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hidden/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hidden thesaurus" https://smartdefine.org/hidden/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, hidden thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hidden/thesaurus/synonyms>. |
| MLA | Smart Define. "hidden thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/hidden/thesaurus/synonyms> |