Search the Bible for G552 in IGNT

ἄπειρος
apeiros
ap'-i-ros
From G1 (as a negative particle) and G3984; inexperienced, that is, ignorant

KJV Usage: unskilful.

Hebrews 5:13 (KJV_Strongs)

13 G1063 For G3956 every one G3348 that useth [G5723] G1051 milk G552 is unskilful G3056 in the word G1343 of righteousness G1063 : for G2076 he is [G5748] G3516 a babe.

Hebrews 5:13 (IGNT)

13 G3956 πας G1063 γαρ For Everyone G3588 ο That G3348 (G5723) μετεχων Partakes G1051 γαλακτος Of Milk G552 απειρος "is" Unskilled G3056 λογου In "the" Word G1343 δικαιοσυνης Of Righteousness, G3516 νηπιος An Infant G1063 γαρ For G2076 (G5748) εστιν He Is;