- Definitions|2
- Thesaurus|878
- Abbreviations|0
44 entries under underground topic. ×
| unknown(adjective, secret, hidden, concealed) | |
| unseen(secret, unknown, hidden, concealed) | |
| abstruse(secret, unknown, hidden, concealed) | |
| clouded(secret, unknown, hidden, concealed) | |
| covered(secret, unknown, hidden, concealed) | |
| discreet(special, intimate, personal, undisclosed) | |
| dissembled(secret, hidden, undisclosed, underhanded) | |
| unpublished(adjective, undisclosed) | |
| ambiguous | |
| backdoor | |
| deep | |
| dissimulated | |
| enigmatical | |
| in ambush(expression, undisclosed) | |
| obscured(secret, hidden, concealed, underhanded) | |
| out-of-the-way | |
| strange | |
| subterrestrial | |
| top-secret(secret, undisclosed) | |
| unacknowledged |
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| APA | Smart Define. (2015). clandestine thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/clandestine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "clandestine thesaurus" https://smartdefine.org/clandestine/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, clandestine thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/clandestine/thesaurus/synonyms>. |
| MLA | Smart Define. "clandestine thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/clandestine/thesaurus/synonyms> |