unmodifiable (adjective) fixed: intent, resolute; established
Sinonime: abiding,
agreed, arranged,
certain, changeless, circumscribed,
confirmed,
decided, defined,
definite,
definitive, determinate,
enduring,
firm, in the bag, inalterable,
inflexible,
inveterate,
level,
limited,
narrow, never-failing,
planned, prearranged,
precise, resolved,
restricted, rigged,
rooted,
set, set-up,
settled,
stated,
steadfast,
steady,
still, stipulated,
sure, unbending, unblinking, unchangeable, undeviating, unfaltering, unflinching, unmodifiable, unmovable, unqualified,
unwaveringAntonime: indefinite,
irresolute, unestablished, unfixed,
variable