Synonyms of accidental

Noun

1. accidental, musical notation

usage: a musical notation that makes a note sharp or flat or natural although that is not part of the key signature

Adjective

1. accidental, inadvertent, unintended (vs. intended)

usage: happening by chance or unexpectedly or unintentionally ; "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"

Definition and meaning of accidental (Dictionary)