- Definitions|2
- Thesaurus|575
- Abbreviations|0
| recherche | |
| remote(strange, new, doubtful, dubious, indefinite) | |
| renownless | |
| sealed | |
| secret(strange, indefinite, unidentified) | |
| signal | |
| so-and-so(strange, new, remote, indefinite, unidentified) | |
| striking | |
| such-and-such(strange, new, remote, indefinite, unidentified) | |
| sui generis | |
| terrific(adjective, unusual, strange, superb, exceptional) | |
| unapparent | |
| unbeknown | |
| uncanny(adjective, unusual, strange) | |
| unclassified | |
| unconvincing(extraordinary, strange, doubtful, dubious, unbelievable) | |
| under the radar | |
| undisclosed | |
| undiscoverable | |
| undivulged |
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| APA | Smart Define. (2015). unheard-of thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/unheard-of/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unheard-of thesaurus" https://smartdefine.org/unheard-of/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2015, unheard-of thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unheard-of/thesaurus/synonyms>. |
| MLA | Smart Define. "unheard-of thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/unheard-of/thesaurus/synonyms> |