serendipitous

/ˌsɛrənˈdɪpɪtəs/
adjective
  1. Happening by chance in a happy or beneficial way; unexpectedly fortunate.
    • Their serendipitous meeting at the coffee shop led to a lifelong friendship.
    • Finding that rare book at the flea market was a serendipitous discovery.
    • The scientist made a serendipitous breakthrough while working on a different experiment.
Antonyms
What does "serendipitous" mean? | whatsthatwordmean | whatsthatwordmean