Synonyms of unalterable

Adjective

1. unalterable (vs. alterable), inalterable, incurable, final, last

usage: not capable of being changed or altered; "unalterable resolve"; "an unalterable ground rule"

2. unalterable, incommutable (vs. commutable)

usage: of a sentence; that cannot be changed; "an unalterable death sentence"

3. changeless, unalterable, unchangeable (vs. changeable)

usage: remaining the same for indefinitely long times

Definition and meaning of unalterable (Dictionary)