inalterable
Adjective
Meaning
Not alterable; incapable of being altered or changed; unalterable.
Source: Webster's dictionarySynonyms
Antonyms
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Were it not for this inalterable armony, pre-established by God, between subject and object, all our thinking would be necessarily without fruit.
We're facing a radical ideology with inalterable objectives: to enslave whole nations and intimidate the world. No act of ours invited the rage of the killers - and no concession, bribe, or act of appeasement would change or limit their plans for murder.
unalterable resolve
an unalterable ground rule