unmodifiable

Adjective

Meaning

incapable of being modified in form or character or strength (especially by making less extreme)

Source: WordNet

fixed constant immutable unchangeable unalterable certain uniform consonant agreed flat arranged consistent firm compatible static

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modifiable inconstant variable uncertain unstable irregular

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these variations from custom are illogical, incomprehensible, and unmodifiable Source: Internet

unmodernized unmodest unmodifiability unmodifiableness unmodifiably unmodified