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Adjective: reasonless  ree-zun-lus
  1. Not marked by the use of reason
    "reasonless hostility";
    - mindless, senseless
     
  2. Not endowed with the capacity to reason
    "a reasonless brute"
     
  3. Having no justifying cause or reason
    "an apparently arbitrary and reasonless change";
    - causeless

See also: irrational, unmotivated, unreasonable

Nearest

reason out
reasonable
reasonable care
reasonableness
reasonably
reasoned
reasoner
reasoning
reasoning backward
reasoning by elimination
reasonless
reassail
reassemble
reassembly
reassert
reassertion
reassess
reassessment
reassign
reassignment
reassume