accidently
adv. B1 Intermediate US //ˈæksədəntɫi// UK //ˈæksɪdəntli// ac·ci·dent·ly
adv. by mistake or without meaning to. You use this when you do something wrong because you were not careful.
adv. by mistake or unintentionally. Informal in register; often used in British English to describe accidental errors.
I accidently deleted the wrong file.
She accidently sent the confidential email to the entire department instead of just her manager.
The software update accidently removed several essential system files, leaving the computer in a state where it could not boot up properly.
From Middle English accidently, accidentli (“by chance; temporarily; artificially”), equivalent to accident + -ly.