Synonyms: unalterable, changeless
Definition: remaining the same for indefinitely long times
Similar words: unchangeable
Definition: not changeable or subject to change
Usage: a fixed and unchangeable part of the germ plasm-Ashley Montagu; the unchangeable seasons; one of the unchangeable facts of life
Synonyms: unalterable
Definition: of a sentence; that cannot be changed
Usage: an unalterable death sentence
Similar words: incommutable
Definition: not subject to alteration or change
Synonyms: unalterable, inalterable
Definition: not capable of being changed or altered
Usage: unalterable resolve; an unalterable ground rule
Similar words: incurable
Definition: unalterable in disposition or habits
Usage: an incurable optimist
Definition: not to be altered or undone
Usage: the judge's decision is final; the arbiter will have the last say