Strong's G3516 — νήπιος (adjective)
nepios (nay'-pee-os) adj.
1. not speaking, i.e. an infant (minor)
2. (figuratively) a simple-minded person, an immature Christian
[from an obsolete particle ne- (implying negation) and G2031]
KJV: babe, child (+ -ish) 
Root(s): G2031 
Hebrew root: ἔπος
Occurrences: 15