coincidentally
Definitions
Happening by chance rather than by design.
Occurring at the same time or during the same period.
Examples
Coincidentally, we both decided to wear the same blue sweater to the party.
I ran into my old high school teacher at the airport, quite coincidentally.
Coincidentally, the store was having a massive sale on the exact day I needed to buy a new laptop.
Synonyms
accidentally serendipitously fortuitously by chance unintentionally casually unexpectedly
Antonyms
deliberately intentionally purposely designedly planned calculatedly systematically