unrecoverable
From Longman Business Dictionaryunrecoverableun‧re‧cov‧er‧a‧ble /ˌʌnrɪˈkʌvərəbəl◂/ adjectiveFINANCE if a loss, debt etc is unrecoverable, it is impossible to get back what is lost or owedRoughly 80% of the £15 million losses is unrecoverable.He used the blank checks to make unrecoverable loans.