unchangeable

unchangeable
    adj 1: not changeable or subject to change; "a fixed and
           unchangeable part of the germ plasm"-Ashley Montagu; "the
           unchangeable seasons"; "one of the unchangeable facts of
           life" [ant: {changeable}, {changeful}]
    

Unchangeable \Unchangeable\
   See {changeable}.
    

125 Moby Thesaurus words for "unchangeable":
      abiding, accordant, adamant, adamantine, alike, automatic,
      balanced, cast-iron, changeless, consistent, consonant, constant,
      continuing, continuous, correspondent, dour, durable, enduring,
      equable, equal, even, firm, fixed, flat, flinty, frozen, grim,
      hard, hard-core, homogeneous, immobile, immovable, immutable,
      implacable, impliable, inalterable, incommutable, inconvertible,
      indefeasible, inelastic, inert, inexorable, inflexible,
      insusceptible of change, intact, intransigent, intransmutable,
      invariable, inviolate, iron, irreconcilable, irretrievable,
      irreversible, irrevocable, lasting, level, measured, mechanical,
      methodic, monolithic, noble, nonreturnable, nonreversible,
      of a piece, ordered, orderly, permanent, perpetual, persistent,
      quiescent, regular, relentless, remaining, reverseless, rigid,
      rigorous, robotlike, rock-ribbed, smooth, solid, stable, static,
      stationary, staying, steadfast, steady, steely, stern, stiff,
      sustained, systematic, torpid, unaffected, unalterable,
      unalterative, unaltered, unbending, unbroken, unchanged,
      unchanging, unchecked, uncompromising, undeflectable, undestroyed,
      undeviating, undifferentiated, undiversified, unfading, unfailing,
      ungiving, uniform, unmodifiable, unmovable, unmoved, unrelenting,
      unremitting, unrestorable, unreturnable, unruffled, unshifting,
      unsusceptible, unvariable, unvaried, unvarying, unyielding