immutable

adjective im·mu·ta·ble \(ˌ)i(m)-ˈmyü-tə-bəl\

: unable to be changed

Full Definition of IMMUTABLE

: not capable of or susceptible to change

— im·mu·ta·bil·i·ty \-ˌmyü-tə-ˈbi-lə-tē\ noun

— im·mu·ta·ble·ness \-ˈmyü-tə-bəl-nəs\ noun

— im·mu·ta·bly \-blē\ adverb

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Middle English, from Latin immutabilis, from in- + mutabilis mutable

First Known Use: 15th century

Synonyms: fixed, hard-and-fast, inflexible, inalterable, incommutable, invariable, unalterable, unchangeable

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