Unalterably

//ʌnˈɑl.təɹ.əbli// adv

Definitions

Adverb
  1. 1
    In an unalterable manner; in a manner that makes it impossible to be altered.

    "First experiences are always the most memorable because they fix themselves in the mind unalterably and most powerfully."

Adverb
  1. 1
    in an unalterable and unchangeable manner wordnet

Etymology

From unalterable + -ly.

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