Strong's #276: ametathetos (pronounced am-et-ath'-et-os)

from 1 (as a negative particle) and a derivative of 3346; unchangeable, or (neuter as abstract) unchangeability:--immutable(-ility).

Thayer's Greek Lexicon:

̓́

ametathetos

1) not transposed, not to be transferred, fixed, unalterable

Part of Speech: adjective

Relation: from G1 (as a negative particle) and a derivative of G3346

Usage:

This word is used 2 times:

 

Hebrews 6:17: "unto the heirs of promise the immutability of his counsel, confirmed"
Hebrews 6:18: "That by two immutable things, in which it was impossible"