Strong's G521 — ἀπαίδευτος (adjective)
apaideutos (ap-ai'-dyoo-tos) adj.
1. uninstructed
2. (figuratively) stupid
[from G1 (as a negative particle) and a derivative of G3811]
KJV: unlearned 
Root(s): G1, G3811 
Hebrew root: παιδεύω
Occurrences: 1