- Definitions|2
- Thesaurus|1.7k
- Abbreviations|0
69 entries under underground topic. ×
| stealthy(adjective, quiet, clandestine, undisclosed) | |
| furtive(adjective, close, clandestine, undisclosed) | |
| sneaky(adjective, clandestine, undisclosed) | |
| surreptitious(adjective, clandestine, undisclosed) | |
| secret(adjective, clandestine, undisclosed, underhand) | |
| sly(verb, adjective, move, clandestine, spiriting) | |
| clandestine(adjective, undisclosed, skulking) | |
| undercover(adjective, clandestine, undisclosed, skulking) | |
| covert(clandestine, undisclosed) | |
| hidden(clandestine, undisclosed) | |
| hush-hush(clandestine, undisclosed, skulking) | |
| mystical(clandestine, undisclosed) | |
| underhanded(adjective, clandestine, undisclosed) | |
| backdoor(close, inside, clandestine, undisclosed) | |
| backstairs(close, restricted, inside, clandestine) | |
| camouflaged(close, clandestine, undisclosed, furtive) | |
| classified(clandestine, undisclosed) | |
| close(inside, clandestine, undisclosed, furtive) | |
| confidential(restricted, clandestine, discreet, undisclosed) | |
| cryptic(close, inside, clandestine, undisclosed) |
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| APA | Smart Define. (2015). sneak thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sneak/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sneak thesaurus" https://smartdefine.org/sneak/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, sneak thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sneak/thesaurus/synonyms>. |
| MLA | Smart Define. "sneak thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/sneak/thesaurus/synonyms> |