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]