Answer: accidental

AnswerCrossword Clue
ACCIDENTALSign that changes the pitch of a note
ACCIDENTALHappening unexpectedly.
ACCIDENTALFortuitous.
ACCIDENTALBy happenstance
ACCIDENTALChance
ACCIDENTALFortuitous
ACCIDENTALUnplanned
accidentalHappening by chance, unintentionally, or unexpectedly
accidental(in Aristotelian thought) Relating to or denoting properties that are not essential to a thing's nature
accidentalIncidental; subsidiary
accidentalby accident / a nonessential property