- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
| unfounded | |
| unobtainable(adjective, impossible) | |
| unreliable(adjective, true, unpredictable, fickle, variable) | |
| unsatisfactory(adjective, poor, thin, false, small) | |
| unsound(adjective, false, unreasonable, senseless, unpredictable) | |
| unworkable(adjective, impossible) | |
| apocryphal | |
| astonishing(extraordinary, amazing, incredible) | |
| baseless(adjective, poor, unconvincing) | |
| cockamamie(extraordinary, amazing, incredible) | |
| cockeyed(extraordinary, amazing, irrational, incredible, unreasoned) | |
| contradictory(adjective, absurd) | |
| deficient(adjective, flat, poor, thin, small) | |
| doubtable | |
| eccentric(adjective, absurd) | |
| exaggerated(adjective, hard, keen, sharp, difficult) | |
| extraordinary(strange, amazing, unbelievable, incredible, unthinkable) | |
| false(adjective, poor, thin, unreasonable, senseless) | |
| far out(expression, adjective, likely, unlikely, unbelievable) | |
| fictitious |
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| APA | Smart Define. (2015). implausible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/implausible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "implausible thesaurus" https://smartdefine.org/implausible/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, implausible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/implausible/thesaurus/synonyms>. |
| MLA | Smart Define. "implausible thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/implausible/thesaurus/synonyms> |