Webster's English Dictionary

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unreasonable

Cross references:
  1. irrational            
 
un.rea.son.able \-'re-z-n*-b*l, -*n-*-\ \-ble-\ aj 1a: not governed by or 
   acting according to reason  1b: not conformable to reason  2: exceeding the 
   bounds of reason or moderation  - un.rea.son.able.ness n