adjective
1. having no justifying cause or reason
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a senseless, causeless murder
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a causeless war that never had an aim
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an apparently arbitrary and reasonless change
• Syn: ↑causeless
• Similar to: ↑unmotivated
2. not marked by the use of reason
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mindless violence
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reasonless hostility
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a senseless act
• Similar to: ↑unreasonable
• Derivationally related forms: ↑mindlessness (for: ↑mindless)
3. not endowed with the capacity to reason
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a reasonless brute
• Similar to: ↑irrational
Useful english dictionary. 2012.