rea·son·less /ˈrizṇləs/
 (a.)無理性的,不明道理的,不合理的


 Rea·son·less, a.
 1. Destitute of reason; as, a reasonless man or mind.
 2. Void of reason; not warranted or supported by reason; unreasonable.
    This proffer is absurd and reasonless.   --Shak.

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 reasonless
      adj 1: not marked by the use of reason; "mindless violence";
             "reasonless hostility"; "a senseless act" [syn: mindless,
              senseless]
      2: not endowed with the capacity to reason; "a reasonless
         brute"
      3: having no justifying cause or reason; "a senseless,
         causeless murder"; "a causeless war that never had an
         aim"; "an apparently arbitrary and reasonless change"
         [syn: causeless]