"causeless" in the adjective sense
1. causeless, reasonless
having no justifying cause or reason
"a senseless, causeless murder"
"a causeless war that never had an aim"
"an apparently arbitrary and reasonless change"
2. causeless, fortuitous, uncaused
having no cause or apparent cause
"a causeless miracle"
"fortuitous encounters
Source: WordNet® (An amazing lexical database of English)
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