- Definitions|1
- Thesaurus|473
- Abbreviations|0
| under cover(expression, adjective, obscure, dark, isolated) | |
| undercover(adjective, obscure, secret, unknown, hidden) | |
| underground(adjective, obscure, secret, unknown, hidden) | |
| underhand(adjective, clandestine, underground, undisclosed) | |
| undetectable | |
| unheard | |
| unheard-of(adjective, strange, new, remote, indefinite) | |
| unknowable(adjective, obscure, dark, superior, supernatural) | |
| unnamed(adjective, strange, secret, indefinite, unidentified) | |
| unnatural(adjective, obscure, dark, superior, mysterious) | |
| unnoted(adjective, strange, new, remote, isolated) | |
| unobservable(adjective, latent) | |
| unplumbed | |
| unrecognized(adjective, strange, new, remote, mysterious) | |
| unsolved | |
| unspied | |
| unspoken | |
| unsuspected | |
| untraced | |
| QT(adjective, secret, unknown, isolated, hidden) |
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| APA | Smart Define. (2015). unrevealed thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unrevealed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unrevealed thesaurus" https://smartdefine.org/unrevealed/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, unrevealed thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unrevealed/thesaurus/synonyms>. |
| MLA | Smart Define. "unrevealed thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unrevealed/thesaurus/synonyms> |