Strong's G97 — ἄδολος (adjective)
adolos (ad'-ol-os) adj.
1. without deceit, honest, sincere
2. (figuratively) unadulterated, pure
[from G1 (as a negative particle) and G1388]
KJV: sincere 
Root(s): G1, G1388 
Hebrew root: δόλος
Occurrences: 1