- Definitions|1
- Thesaurus|293
- Abbreviations|0
66 entries under underground topic. ×
| unknown(adjective, clandestine, undisclosed, nameless) | |
| incognito(close, unknown, clandestine, undisclosed) | |
| hidden(clandestine, undisclosed) | |
| mysterious(adjective, clandestine, undisclosed) | |
| obscure(unknown, clandestine, undisclosed, anonymous) | |
| backdoor(close, sensitive, inside, clandestine) | |
| backstairs(close, sensitive, inside, clandestine) | |
| camouflaged(close, clandestine, undisclosed, furtive) | |
| clandestine(adjective, undisclosed) | |
| classified(sensitive, clandestine, undisclosed, sub-rosa) | |
| close(inside, clandestine, undisclosed, furtive) | |
| confidential(adjective, clandestine, undisclosed) | |
| covert(clandestine, undisclosed) | |
| cryptic(close, inside, clandestine, undisclosed) | |
| discreet(close, inside, clandestine, undisclosed) | |
| disguised(clandestine, undisclosed) | |
| dissembled(close, clandestine, undisclosed, furtive) | |
| dissimulated(close, inside, clandestine, undisclosed) | |
| furtive(close, clandestine, undisclosed) | |
| hush-hush(clandestine, undisclosed) |
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| APA | Smart Define. (2015). unacknowledged thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unacknowledged/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unacknowledged thesaurus" https://smartdefine.org/unacknowledged/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, unacknowledged thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unacknowledged/thesaurus/synonyms>. |
| MLA | Smart Define. "unacknowledged thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unacknowledged/thesaurus/synonyms> |