causeless
1. [ adjective ] having no justifying cause or reason
Synonyms: reasonless
Examples:

"a senseless, causeless murder" "a causeless war that never had an aim" "an apparently arbitrary and reasonless change"

Related terms: unmotivated
2. [ adjective ] having no cause or apparent cause
Synonyms: uncaused fortuitous
Examples:

"a causeless miracle" "fortuitous encounters--strange accidents of fortune" "we cannot regard artistic invention as...uncaused and unrelated to the times"

Related terms: unintended
Similar spelling:   casals
  Casillas
  ceaseless