unrecoverable
adjective
uk/ˌʌnrɪˈkʌvərəbl/ us FINANCE
used to describe money that someone has lost or lent and will never get back:
unrecoverable costs/debts/loans The credit union had unrecoverable loans totalling 235 billion yen.
IT
used to describe information on a computer that has been lost and cannot be found:
The data recovery company could restore the client's unrecoverable data from the hard drive.
IT
used to describe a mistake in a computer program that cannot be corrected:
The critical systems folder was deleted, which might have resulted in an unrecoverable system crash.