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Adjective: unalterable  ún'olturubul
  1. Not capable of being changed or altered
    "unalterable resolve"; "an unalterable ground rule"
    - inalterable
     
  2. 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, unalterability, unalterably, unchangeable

Antonym: alterable