Strong's #4258: proamartano (pronounced pro-am-ar-tan'-o)

from 4253 and 264; to sin previously (to conversion):--sin already, heretofore sin.

Thayer's Greek Lexicon:

́

proamartanō

1) to sin before

1a) of those who before receiving baptism had been guilty of the vices especially common among the Gentiles

Part of Speech: verb

Relation: from G4253 and G264

Usage:

This word is used 2 times:

 

2 Corinthians 12:21: "and that I shall bewail many which have sinned already, and have not repented of"
2 Corinthians 13:2: "being absent now I write to them which heretofore have sinned, and to all other, that,"