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Adjective: unalterable  ,ún'ol-tu-ru-bul
  1. Not capable of being changed or altered
    "an unalterable ground rule"; "unalterable resolve";
    - inalterable
  2. (law) of a sentence; that cannot be changed
    "an unalterable death sentence"
  3. Remaining the same for indefinitely long times
    - changeless

See also: final, incommutable, incurable, last, unchangeable

Antonym: alterable