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unreasonable 
1 excessive, exorbitant, extortionate, extravagant, immoderate, steep  (informal) too great, uncalled-for, undue, unfair, unjust, unwarranted 
2 arbitrary, biased, blinkered, capricious, erratic, headstrong, inconsistent, opinionated, quirky 
3 absurd, far-fetched, foolish, illogical, irrational, mad, nonsensical, preposterous, senseless, silly, stupid 
 
Antonyms  
 
1 fair, just, justified, moderate, reasonable, temperate, warranted 
2 fair-minded, flexible, open-minded 
3 logical, rational, sensible, wise 



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