- Definitions|2
- Thesaurus|5.6k
- Abbreviations|0
82 entries under adjective topic. ×
| foolish(sound, wise) | |
| absurd(senseless, ridiculous) | |
| flimsy(strong, sound, implausible, unconvincing) | |
| unjustified | |
| biased(senseless, irrational, unsound) | |
| dictatorial | |
| extreme | |
| goofy | |
| groundless(reason, justification) | |
| impossible | |
| inconceivable(belief, imaginable) | |
| inflexible(soft, yielding, stubborn) | |
| preposterous(ridiculous, bizarre) | |
| ridiculous(stupid, funny) | |
| unbelievable(foolish, plausible) | |
| undue(excessive, unnecessary) | |
| unlikely(senseless, irrational, unsound, likely) | |
| unsound(strong, sound, well, senseless) | |
| untenable | |
| unwise(senseless, irrational, unsound) |
For more, visit
Reasonable on
Power Thesaurus
| APA | Smart Define. (2016). reasonable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/reasonable/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "reasonable thesaurus" https://smartdefine.org/reasonable/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, reasonable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/reasonable/thesaurus/antonyms>. |
| MLA | Smart Define. "reasonable thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/reasonable/thesaurus/antonyms> |