| pop-up | |
| privy | |
| quiet | |
| restricted(clandestine, underground, undisclosed) | |
| secluded(obscure, unknown, clandestine, underground, undisclosed) | |
| sneak(clandestine, underground, undisclosed) | |
| sneaky(clandestine, underground, undisclosed) | |
| spontaneous | |
| strange(obscure, deep, unknown, clandestine, underground) | |
| sub-rosa(clandestine, underground, undisclosed) | |
| surprise | |
| top-secret(clandestine, underground, undisclosed) | |
| top secret(expression, clandestine, underground, undisclosed) | |
| unacknowledged(clandestine, underground, undisclosed) | |
| unannounced(adjective, disclosed) | |
| uncirculated | |
| under-the-table(clandestine, underground, undisclosed) | |
| under false pretense(expression, idiom, clandestine, underground, undisclosed) | |
| under wraps(expression, clandestine, underground, undisclosed) | |
| undercover(clandestine, underground, undisclosed) |
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Power Thesaurus
| APA | Smart Define. (2015). unpublished thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unpublished/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unpublished thesaurus" https://smartdefine.org/unpublished/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, unpublished thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unpublished/thesaurus/synonyms>. |
| MLA | Smart Define. "unpublished thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/unpublished/thesaurus/synonyms> |