unalterable

Etymology

un- + alterable

adj

  1. Incapable of being altered, or of changing.
    ... every statute in the Bible and in the law books is an attempt to defeaat a law of God—in other words an unalterable and indestructible law of nature. c. 1909, Mark Twain, Letters from the Earth, Letter VIII
  2. Irreversible, irrevocable.

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