reasonless

Adjective

• having no justifying cause or reason
  • a senseless, causeless murder
    
  • a causeless war that never had an aim
    
  • an apparently arbitrary and reasonless change
    

• not endowed with the capacity to reason
  • a reasonless brute
    

• not marked by the use of reason
  • mindless violence
    
  • reasonless hostility
    
  • a senseless act
    

Related words

• Synonyms: 
  causeless , mindless , senseless