"unalterable" in the adjective sense
1. unalterable, inalterable
not capable of being changed or altered
"unalterable resolve"
"an unalterable ground rule"
2. unalterable
of a sentence that cannot be changed
"an unalterable death sentence"
3. changeless, unalterable
remaining the same for indefinitely long times
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License