Strong's G551 — ἀπείραστος (adjective)
apeirastos (ap-ei'-ras-tos) adj.
1. untried, i.e. not temptable
[from G1 (as a negative particle) and a presumed derivative of G3987]
KJV: not to be tempted 
Root(s): G1, G3987 
Hebrew root: πειράω
Occurrences: 1