inadvertent
adj. C1 Advanced US //ˌɪnædˈvɝtənt// UK //ɪnɐdvˈɜːtənt// in·ad·ver·tent
adj. done by accident or without meaning to. You use this to describe something that happens because you were not paying attention.
adj. done or occurring without intention or without being noticed. Often used in legal or formal contexts to describe unintentional errors or omissions.
The mistake was inadvertent and easily corrected.
The lawyer argued that the evidence was discovered through an inadvertent error in the filing process.
While the breach of protocol was inadvertent, the committee still felt it necessary to issue a formal apology to the affected guests.
Borrowed from Medieval Latin inadvertēns.