Fortuitous /(?)/

For·tu·i·tous

Fortuitous

a.
  1. Happening by chance; coming or occuring unexpectedly, or without any known cause; chance; as, the fortuitous concourse of atoms.
    It was from causes seemingly fortuitous . . . that all the mighty effects of the Reformation flowed.
    — Robertson.
    So as to throw a glancing and fortuitous light upon the whole.
    — Hazlitt.
  2. Happening independently of human will or means of foresight; resulting from unavoidable physical causes. (LAw)