70 entries under underground topic. ×
| conspiratorial(clandestine, undisclosed) | |
| covered(clandestine, undisclosed) | |
| deep(clandestine, undisclosed) | |
| discreet(clandestine, undisclosed) | |
| disguised(clandestine, undisclosed) | |
| enigmatical(clandestine, undisclosed) | |
| incognito(clandestine, discreet, undisclosed) | |
| mystic(clandestine, undisclosed) | |
| mystical(clandestine, undisclosed) | |
| on the QT(expression, idiom, private, clandestine) | |
| out-of-the-way(clandestine, undisclosed) | |
| recondite(clandestine, undisclosed) | |
| reticent(clandestine, undisclosed) | |
| retired(clandestine, undisclosed) | |
| shrouded(clandestine, undisclosed) | |
| sly(clandestine, undisclosed) | |
| sneaky(clandestine, undisclosed) | |
| surreptitious(secret, clandestine, undisclosed, top-secret) | |
| unacknowledged(clandestine, undisclosed) | |
| under false pretense(expression, idiom, clandestine, undisclosed) |
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| APA | Smart Define. (2016). restricted thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/restricted/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "restricted thesaurus" https://smartdefine.org/restricted/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, restricted thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/restricted/thesaurus/synonyms>. |
| MLA | Smart Define. "restricted thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/restricted/thesaurus/synonyms> |