ἀμετάθετος G276
ametáthetos · am-et-ath'-et-os · Adjective
from Α (as a negative particle) and a derivative of μετατίθημι; unchangeable, or (neuter as abstract) unchangeability:--immutable(-ility).
2 Occurrences in the King James Bible
Hebrews 6:17Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
Hebrews 6:18That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: