serendipitous
adjective
[ ˌsɛr(ə)nˈdɪpɪtəs ]
• occurring or discovered by chance in a happy or beneficial way.
• "a serendipitous encounter"
Similar:
chance,
accidental,
lucky,
fortuitous,
unexpected,
unanticipated,
unforeseen,
unlooked-for,
coincidental,
fluky,
