causeless

Adjective Satellite

• having no justifying cause or reason
  • "a senseless, causeless murder"
  • "a causeless war that never had an aim"
• having no cause or apparent cause
  • "a causeless miracle"

Adj

• Having no obvious cause; fortuitous or inexplicable.
• Groundless or unreasonable.

Synonyms

fortuitous, reasonless, uncaused, accidental, accidentary, adventitious, by accident, by the by, casual, causeless, chanceable, incidental, lippening, occasional, random, serendipitous, unforeseen, unintended, unintentional, unplanned