- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
| unlikely(adjective, reasonable, unreasonable, likely) | |
| unbelievable(adjective, unreasonable) | |
| implausible(adjective, reasonable, unreasonable, likely) | |
| inconceivable(adjective, reasonable, unreasonable, imaginable) | |
| flimsy(adjective, strong, sound, implausible, unconvincing) | |
| doubtful | |
| far-fetched(adjective, hard) | |
| illogical | |
| improbable(adjective, unreasonable, likely) | |
| impossible(adjective, unreasonable) | |
| unreasonable | |
| unimaginable(adjective, unreasonable) | |
| incredible(adjective, bad, unremarkable) | |
| fantastical | |
| questionable | |
| unconvincing | |
| unthinkable | |
| fantastic | |
| preposterous | |
| unsustainable |
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| APA | Smart Define. (2015). plausible thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/plausible/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "plausible thesaurus" https://smartdefine.org/plausible/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, plausible thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/plausible/thesaurus/antonyms>. |
| MLA | Smart Define. "plausible thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/plausible/thesaurus/antonyms> |