irrecoverable

This term carries a heavy sense of finality and permanence. In technical contexts, it describes a total loss where no backup or forensic method can restore the original state, distinguishing it from "recoverable" data that might be difficult but possible to retrieve.

In medical or financial contexts, the word implies a point of no return. It is more clinical and absolute than "hopeless," focusing on the objective impossibility of restoration rather than a subjective feeling of despair.