inalterableness

/ˌɪnˈɔːltərəbəlnəs/
noun
  1. The state or quality of being inalterable; inability to be changed.
    • The inalterableness of the historical record made it a reliable source for researchers.
    • The inalterableness of her character made her predictable but trustworthy.
    • He was frustrated by the inalterableness of the computer's default settings.
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