Definition of unalterable adjective from the Oxford Advanced American Dictionary

      

    unalterable

     adjective
    adjective
    NAmE//ʌnˈɔltərəbl//
     
    (formal)
     
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  1. 1that cannot be changed synonym immutable
  2. 2 the unalterable laws of the universe an unalterable belief
See the Oxford Advanced Learner's Dictionary entry: unalterable