Adjective fortuitous has 2 senses
  1. causeless, fortuitous, uncaused - having no cause or apparent cause; "a causeless miracle"; "fortuitous encounters--strange accidents of fortune"; "we cannot regard artistic invention as...uncaused and unrelated to the times"
    Antonym: intended (indirect, via unintended)
  2. fortuitous - occurring by happy chance; "profits were enhanced by a fortuitous drop in the cost of raw materials"
    Antonym:
    unfortunate (indirect, via fortunate)
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