fortuitously
Definitions
By a fortunate chance; luckily.
Happening by accident or chance rather than design.
Examples
We fortuitously arrived at the station just as the train was pulling in.
The lost key was fortuitously discovered under the rug by the cleaning crew.
He fortuitously met his future business partner while waiting in line for coffee.
Synonyms
luckily happily accidentally serendipitously coincidentally providentially unexpectedly
Antonyms
unluckily unhappily deliberately intentionally purposely adversely unfavorably