Synonyms: 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
Similar words: unalterable, changeless
Definition: remaining the same for indefinitely long times
Similar words: confirmed
Definition: of persons; not subject to change
Usage: a confirmed bachelor; a confirmed invalid
Definition: incapable of being changed or moved or undone; e.g. "frozen prices"
Usage: living on fixed incomes
Similar words: set in stone, carved in stone
Definition: no longer changeable
Usage: the agreement is not yet set in stone
Similar words: stable, static, unchanging
Definition: showing little if any change
Usage: a static population