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• s  not marked by the use of reason
  reasonless hostility
• s  not endowed with the capacity to reason
  a reasonless brute
• s  having no justifying cause or reason
  an apparently arbitrary and reasonless change

• Sir: Just because you did not like Foss's cello Concert March 17 is no reason for name-calling and reasonless ridicule.

• mindless
• senseless
• causeless

Quotes

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• Evelyn Waugh in San Francisco Chronicle
  It was "not mountaineering that attracted him" to Afghanistan, Waugh wrote. "It was the longing, romantic, reasonless, ...... simply to set foot where few civilized feet have trod."