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Definition of unalterable adjective from the Oxford Advanced Learner's Dictionary

unalterable

adjective
 
/ʌnˈɔːltərəbl/
 
/ʌnˈɔːltərəbl/
(formal)
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  1. that cannot be changed synonym immutable
    • the unalterable laws of the universe
    • an unalterable belief
See unalterable in the Oxford Advanced American Dictionary
fever
noun
 
 
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