- Definitions|1
- Thesaurus|860
- Abbreviations|0
53 entries under underground topic. ×
| out-of-the-way(clandestine, undisclosed) | |
| restricted(adjective, secret, clandestine, undisclosed) | |
| retired(clandestine, undisclosed) | |
| strange(clandestine, undisclosed) | |
| subterrestrial | |
| top-secret(secret, clandestine, undisclosed) | |
| top secret(expression, clandestine, undisclosed) | |
| unacknowledged(clandestine, undisclosed) | |
| under false pretense(expression, idiom, clandestine, undisclosed) | |
| unenlightened(clandestine, undisclosed) | |
| unfrequented(clandestine, undisclosed) | |
| unintelligible(clandestine, undisclosed) | |
| unpublished(clandestine, undisclosed) |
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| APA | Smart Define. (2015). undercover thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/undercover/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undercover thesaurus" https://smartdefine.org/undercover/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, undercover thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/undercover/thesaurus/synonyms>. |
| MLA | Smart Define. "undercover thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/undercover/thesaurus/synonyms> |