Dictionary

unalterable

adjective un·al·ter·able \ˌən-ˈl-t(ə-)rə-bəl\

: not capable of being changed or altered

Full Definition of UNALTERABLE

:  not capable of being altered or changed <an unalterable resolve> <unalterable hatred>
un·al·ter·abil·i·ty \ˌən-ˌl-t(ə-)rə-ˈbi-lə-tē\ noun
un·al·ter·able·ness \ˌən-ˈl-t(ə-)rə-bəl-nəs\ noun
un·al·ter·ably \-blē\ adverb

Examples of UNALTERABLE

  1. <the rules of the game are unalterable, regardless of who is playing>

First Known Use of UNALTERABLE

circa 1605

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