not capable of being altered, changed, or modified.

1610–15; un-1 + alterable

unalterableness, unalterability, noun
unalterably, adverb
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World English Dictionary
unalterable (ʌnˈɔːltərəbəl, -ˈɔːltrəbəl)
(of a condition, truth, etc) unable to be changed or altered

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Before him, doctrine held that the heavens were perfect and unalterable.
In other words, predation is an unalterable fact of life.
Instead you have a unalterable world view that denies anything that conflicts
  with it.
Accepting her lot as unalterable, she makes the best of it even when her
  husband loses his job.
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