- Definitions|2
- Thesaurus|575
- Abbreviations|0
| uncustomary | |
| unearthly | |
| unexplained(strange, new, remote, indefinite, unidentified) | |
| unexplored(strange, new, remote, indefinite, unidentified) | |
| unexposed(adjective, unfound) | |
| unimagined | |
| unknowable(extraordinary, strange, unbelievable, implausible, unfathomable) | |
| unnoted(strange, new, remote, unknown, indefinite) | |
| unnoticed | |
| unordinary | |
| unparalleled | |
| unperceived(strange, new, remote, indefinite, unidentified) | |
| unrevealed(strange, new, remote, indefinite, unidentified) | |
| unwonted(strange, exceptional, marvelous, special, unfathomable) | |
| wondrous(adjective, superb, marvelous, fantastic, magnificent) | |
| X(strange, new, remote, unknown, indefinite) | |
| absurd(doubtful, dubious, improbable) | |
| alien(adjective, unusual, strange, new, remote) | |
| beguiling | |
| belief(extraordinary, strange, unbelievable, implausible, unthinkable) |
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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> |