- Definitions|2
- Thesaurus|1.1k
- Abbreviations|0
| inconceivable(adjective, reasonable, belief, unreasonable, unbelievable) | |
| incredible(adjective, unreasonable, unbelievable) | |
| unbelievable(adjective, unreasonable, plausible) | |
| unthinkable(adjective, unusual, unreasonable, unbelievable, incredible) | |
| implausible(adjective, reasonable, unreasonable, likely, unbelievable) | |
| improbable(adjective, unreasonable, likely, unbelievable) | |
| unimaginable(adjective, unreasonable, unbelievable) | |
| dubious(adjective, clear, honest) | |
| ridiculous(adjective, stupid, funny) | |
| suspicious(adjective, careless, certain, doubtful, fishy) | |
| unconvincing(adjective, unreasonable, unbelievable, persuasive) | |
| unlikely(adjective, reasonable, unreasonable, likely, unbelievable) | |
| unreliable(adjective, unreasonable, unbelievable) | |
| far-fetched(adjective, hard, natural) | |
| doubtful | |
| fantastic | |
| impossible | |
| preposterous | |
| questionable | |
| tall(adjective, unreasonable, little, exaggerated) |
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| APA | Smart Define. (2015). believable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/believable/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "believable thesaurus" https://smartdefine.org/believable/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, believable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/believable/thesaurus/antonyms>. |
| MLA | Smart Define. "believable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/believable/thesaurus/antonyms> |