Irrevocable

(a.) Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; irrevocable fate.

Thesaurus Entries

absolute, beyond recall, beyond remedy, binding, certain, changeless, compulsory, conclusive, constant, cureless, decisive, decretory, dictated, enduring, entailed, established, everlasting, fated, fateful, final, fixed, gone, hard-and-fast, immedicable, immutable, imperative, imposed, incommutable, inconvertible, incorrigible, incurable, indefeasible, ineluctable, inert, inescapable, inevasible, inevitable, inexorable, inflexible, inoperable, insusceptible of change, intransmutable, invariable, irreclaimable, irrecoverable, irredeemable, irreformable, irremediable, irreparable, irresistible, irretrievable, irreversible, lasting, lost, mandated, mandatory, must, necessary, noble, nonreturnable, nonreversible, obligatory, past hope, past praying for, peremptory, permanent, prescript, prescriptive, relentless, remediless, required, resistless, reverseless, ruined, settled, sure, sure as death, sure as fate, terminal, ultimate, unalterable, unalterative, unaltered, unavoidable, unchangeable, unchanged, unchanging, uncontrollable, undeflectable, undeviating, undone, unmitigable, unmodifiable, unpreventable, unrelievable, unremitting, unrestorable, unreturnable, unsalvable, unsalvageable, unstoppable, unsusceptible, unvariable, unvarying, unyielding, without appeal