/ ɪˈmjuːtəbl; NAmE / adjective
( formal ) that cannot be changed; that will never change
SYN unchangeable
► im·mut·abil·ity / ɪˌmjuːtəˈbɪləti; NAmE / noun [ U ]
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WORD ORIGIN
late Middle English : from Latin immutabilis , from in- not + mutabilis , from mutare to change.