indefeasible Synonyms

insusceptible of change relentless prescribed permanent perdurable lasting irrevocable irreversible irretrievable inviolable intransmutable reverseless sacrosanct sure undisputed unchallenged unchallengeable unvarying always-on untransferable unchanging unyielding unremitting unalienable intractable insuperable chronic chartered changeless certain ceaseless boundless authorized allowed ageless absolute constant constitutional immutable innate inherent inextinguishable inert indomitable incommutable inalienable imprescriptible impregnable imperishable abiding