Irrevocable
Irrevocable , adjective
[Latin irrevocabilis: compare French irrévocable. See In- not, and Revoke, and compare Irrevocable.]
Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; irrevocable fate.
Firm and irrevocable is my doom.