- Definitions|0
- Thesaurus|344
- Abbreviations|0
| tenuous | |
| unanticipated | |
| unbelievable(doubtful, unlikely, implausible) | |
| uncertain(doubtful, unlikely, implausible) | |
| unconvincing(doubtful, unlikely, implausible) | |
| unforeseen | |
| unfrequent | |
| unimaginable(light, thin, special, doubtful, rare) | |
| uninvestigated | |
| unlikely(adjective, light, thin, doubtful, rare) | |
| unsubstantial(doubtful, unlikely, implausible) | |
| unthinkable(light, thin, extraordinary, unusual, strange) | |
| unusual(light, thin, extraordinary, exceptional, special) | |
| unwonted(light, thin, extraordinary, unusual, strange) | |
| weak(doubtful, unlikely, implausible) | |
| QT(isolated, reclusive, uncompanionable) | |
| X(strange, indefinite, unidentified) | |
| aberrant(unusual, special, odd, rare, bizarre) | |
| abnormal(unusual, special, odd, rare, bizarre) | |
| adulterated |
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| APA | Smart Define. (2013). unheard of thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unheard_of/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "unheard of thesaurus" https://smartdefine.org/unheard_of/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2013, unheard of thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unheard_of/thesaurus/synonyms>. |
| MLA | Smart Define. "unheard of thesaurus" 19 May 2013. Web. 29 September 2026. <https://smartdefine.org/unheard_of/thesaurus/synonyms> |