fortuitous

/fɔːˈtjuːɪtəs/adjective

Coming about by chance or accident rather than by plan.

Example sentence

“Our meeting at the airport was entirely fortuitous.”

Strictly it means 'by chance', not 'lucky', though the lucky sense now dominates. Careful writers use 'fortunate' for luck and keep this one for accident.

Related words

fortunateComing about through good luck; lucky.fortitudeThe strength of mind to face pain or hardship bravely.fortuneLuck, especially of the good kind.fortifyTo make a place stronger against attack by building defenses; to strengthen something.fosterTo raise and care for a child, especially one who is not yours by birth, or to help something grow and develop.forthrightA path that runs straight ahead without turns.