| sealed | |
| so-and-so(adjective, strange, new, remote, mysterious) | |
| such-and-such(adjective, strange, new, remote, mysterious) | |
| unacknowledged | |
| unapparent | |
| uncelebrated(adjective, strange, new, remote, mysterious) | |
| under the radar | |
| undiagnosed | |
| undiscoverable | |
| undistinguished(adjective, strange, new, ordinary, remote) | |
| undivulged | |
| unexposed | |
| unfathomed | |
| unheard | |
| unheard of(verb, expression, adjective, phrasal verb, strange) | |
| unknowable | |
| unnoted(adjective, strange, new, remote, indefinite) | |
| unplumbed | |
| unrenowned(adjective, strange, new, remote, mysterious) | |
| unsuspected |
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Unidentified on
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| APA | Smart Define. (2015). unidentified thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unidentified/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unidentified thesaurus" https://smartdefine.org/unidentified/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, unidentified thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unidentified/thesaurus/synonyms>. |
| MLA | Smart Define. "unidentified thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unidentified/thesaurus/synonyms> |