(a.) Not retrievable; irrecoverable; irreparable; as, an irretrievable loss.

ablated beyond recall beyond remedy by the board changeless constant consumed cureless depleted dissipated eroded expended forfeit forfeited gone immedicable immutable incommutable inconvertible incorrigible incurable indefeasible inert inoperable insusceptible of change intransmutable invariable irreclaimable irrecoverable irredeemable irreformable irremediable irreparable irreversible irrevocable lasting long-lost lost lost to noble nonreturnable nonreversible out the window past hope past praying for permanent remediless reverseless ruined shrunken squandered terminal unalterable unalterative unaltered unchangeable unchanged unchanging uncorrectable undeflectable undeviating undone unmitigable unmodifiable unrelievable unremitting unrestorable unreturnable unsalvable unsalvageable unsusceptible unvariable unvarying used used up wasted worn away