Notes on The Epistle of St. Paul the Apostle to the Romans (Author Bishop Richard Challoner (ed.))
5:13 Not imputed: That is, men knew not, or made no account of sin, neither was it imputed to them, in the manner it was afterwards, when they transgressed the known written law of God.
Original Douay-Rheims from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.