Synonyms of unrecoverable

2 Syllables
fatal, serious, deadly, no-go, no-way, noway
3 Syllables
terminal, cureless, hopeless
4 Syllables
impossible, incurable, remediless, irremedial, unworkable
5 Syllables
inoperable, immedicable, irremediable, irreplaceable, irrealizable, irreparable, uncorrectable, irretrievable, unrealizable
6 Syllables
irrecoverable