- Definitions|2
- Thesaurus|575
- Abbreviations|0
| fantastic(adjective, extraordinary, unusual, strange, superb) | |
| inconceivable(adjective, obscure, belief, exceptional, marvelous) | |
| novel(adjective, obscure, unique) | |
| unidentified(adjective, strange, new, remote, indefinite) | |
| weird | |
| undiscovered(adjective, obscure, strange, new, remote) | |
| unimaginable(adjective, extraordinary, strange, exceptional, special) | |
| abnormal | |
| curious | |
| incredible(adjective, extraordinary, unusual, strange, superb) | |
| new(adjective, obscure, strange, exceptional, fantastic) | |
| offbeat | |
| out-of-the-way | |
| outrageous | |
| phenomenal(adjective, excellent, extraordinary, unusual, strange) | |
| queer | |
| shocking(adjective, obscure, unique) | |
| unaccountable(adjective, strange, unfathomable, puzzling, explainable) | |
| uncharted(adjective, strange, new, remote, unknown) | |
| undistinguished(adjective, strange, new, remote, unknown) |
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| APA | Smart Define. (2015). unheard-of thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unheard-of/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unheard-of thesaurus" https://smartdefine.org/unheard-of/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, unheard-of thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unheard-of/thesaurus/synonyms>. |
| MLA | Smart Define. "unheard-of thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/unheard-of/thesaurus/synonyms> |