fortuitous

Adjective
  1. Having no cause or apparent cause (synset 301342240)
    "a causeless miracle"; "fortuitous encounters--strange accidents of fortune"; "we cannot regard artistic invention as...uncaused and unrelated to the times"
    similar to: unintended - not deliberate
    same as: causeless, uncaused
  2. Occurring by happy chance (synset 301052286)
    "profits were enhanced by a fortuitous drop in the cost of raw materials"
    similar to: fortunate - having unexpected good fortune

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