- Definitions|2
- Thesaurus|575
- Abbreviations|0
| unthinkable(adjective, extraordinary, strange, exceptional, marvelous) | |
| anonymous(adjective, strange, unknown, indefinite, unidentified) | |
| different | |
| incomprehensible(adjective, strange, unfathomable, puzzling) | |
| little-known(adjective, obscure, unique) | |
| miraculous(adjective, pleasant, extraordinary, superb, exceptional) | |
| original | |
| outstanding(adjective, excellent, extraordinary, unusual, strange) | |
| prodigious | |
| unlikely(adjective, obscure, extraordinary, strange, doubtful) | |
| unnamed(adjective, strange, unknown, indefinite, unidentified) | |
| unrenowned(adjective, obscure, strange, new, remote) | |
| able | |
| astonishing(adjective, unusual, strange, superb, exceptional) | |
| astounding(adjective, pleasant, strange, superb, exceptional) | |
| disgraceful | |
| eccentric | |
| exotic(adjective, strange, new, exceptional, fantastic) | |
| extreme | |
| fabulous(adjective, pleasant, superb, marvelous, fantastic) |
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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> |