Synonyms and related words :
abiding, changeless, constant, continuing, durable, enduring, firm, fixed, frozen, immobile, immutable, incommutable, inconvertible, indefeasible, inert, insusceptible of change, intact, intransmutable, invariable, inviolate, irretrievable, irreversible, irrevocable, lasting, noble, nonreturnable, nonreversible, permanent, perpetual, persistent, quiescent, remaining, reverseless, rigid, solid, stable, static, stationary, staying, steadfast, sustained, torpid, unalterable, unalterative, unchangeable, unchanged, unchanging, unchecked, undeflectable, undestroyed, undeviating, unfading, unfailing, unmodifiable, unremitting, unrestorable, unreturnable, unshifting, unsusceptible, unvariable, unvaried, unvarying