adjective
having no cause or apparent cause (Freq. 1)
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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: ↑causeless, ↑fortuitous
• Similar to: ↑unintended
• Derivationally related forms: ↑fortuitousness (for: ↑fortuitous)
Useful english dictionary. 2012.