accidental

Words with a similar base: accidental

'accidental'

[accidental.n.01] as in: a musical notation that makes a note sharp or flat or natural although that is not part of the key signature

'accidental'

[accidental.s.01] as in: happening by chance or unexpectedly or unintentionally

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Examples:
with an inadvertent gesture she swept the vase off the table
accidental poisoning
an accidental shooting