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inadvertent

[ˌɪnədˈvɜːrtnt]

adj. done by accident, without being intended

A person accidentally knocking a coffee cup off a desk

An inadvertent error in the report caused weeks of confusion.

"Oops!... I Did It Again" by Britney Spears

The repeated 'oops' suggests inadvertent mistakes made without intention.

advert vi. inadvertent manslaughter