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: ↑reasonless
• Similar to: ↑unmotivated
2. having no cause or apparent cause
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a causeless miracle
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fortuitous encounters—strange accidents of fortune
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we cannot regard artistic invention as...uncaused and unrelated to the times
• Syn: ↑fortuitous, ↑uncaused
• Similar to: ↑unintended
• Derivationally related forms: ↑fortuitousness (for: ↑fortuitous)
Useful english dictionary. 2012.