irrevocable (adj.)

• absolute
• binding
• certain
• changeless
• compulsory
• conclusive
• constant
• decisive
• dictated
• enduring
• established
• everlasting
• fated
• fateful
• final
• fixed
• gone
• hard-and-fast
• immutable
• imperative
• imposed
• incommutable
• inconvertible
• incorrigible
• incurable
• indefeasible
• ineluctable
• inert
• inescapable
• inevitable
• inexorable
• inflexible
• inoperable
• invariable
• irreclaimable
• irrecoverable
• irredeemable
• irremediable
• irreparable
• irresistible
• irretrievable
• irreversible
• lasting
• lost
• mandatory
• must
• necessary
• noble
• nonreturnable
• nonreversible
• obligatory
• peremptory
• permanent
• prescriptive
• relentless
• required
• resistless
• ruined
• settled
• sure
• terminal
• ultimate
• unalterable
• unaltered
• unavoidable
• unchangeable
• unchanged
• unchanging
• uncontrollable
• undeviating
• undone
• unmitigable
• unmodifiable
• unpreventable
• unremitting
• unstoppable
• unsusceptible
• unvarying
• unyielding