Strong's G893 — ἀψευδής (adjective)
apseudes (aps-yoo-dace') adj.
1. (properly) without lies or falsehood
2. (concretely) truthful, veracious
[from G1 (as a negative particle) and G5579]
KJV: that cannot lie 
Root(s): G1, G5579 
Hebrew root: ψεῦδος
Occurrences: 1