- Definitions|2
- Thesaurus|575
- Abbreviations|0
21 entries under dubious topic. ×
| strange(adjective, excellent, obscure, extraordinary, unusual) | |
| unbelievable(adjective, obscure, extraordinary, strange, doubtful) | |
| inconceivable(adjective, obscure, belief, exceptional, marvelous) | |
| unimaginable(adjective, extraordinary, strange, exceptional, special) | |
| incredible(adjective, extraordinary, unusual, strange, superb) | |
| unlikely(adjective, obscure, extraordinary, strange, doubtful) | |
| absurd(doubtful, improbable) | |
| doubtful | |
| implausible(extraordinary, strange, doubtful, unbelievable) | |
| improbable(extraordinary, strange, doubtful, unbelievable) | |
| remote(strange, new, doubtful, indefinite) | |
| unconvincing(extraordinary, strange, doubtful, unbelievable) | |
| contrary(doubtful, improbable) | |
| faint(doubtful, improbable) | |
| not likely(expression, doubtful, improbable) | |
| not probable(expression, doubtful, improbable) | |
| out of the ordinary(expression, idiom, exceptional, special, doubtful) | |
| outside chance(expression, doubtful, improbable) | |
| questionable(doubtful, improbable) | |
| slight(doubtful, improbable) |
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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> |