Let me help you out here Tallman no it doesnt mean Noah did not sin ...As we know there was only one without sin and that was Jesus Christ So the question is what is Scripture saying here ... We can not have a contradiction here ... Gods Word has none but this would create a biggie if it were saying Noah was without sin ...It would litterally put Noah on a par with Jesus and this cannot be ... So we need to see what this word Perfect means more in depth. The best easy to understand source I know of is the appendix to the Companion Bible here is appen 26. (you can access the appendix from our resources area) 26. NOAH "PERFECT". (GEN. 6:9).The Heb. word tamim means without blemish, and is the technical word for bodily and physical perfection, and not moral. Hence it is used of animals of sacrificial purity. It is rendered without blemish in Ex. 12:5; 29:1. Lev. 1:3, 10; 3:1, 6; 4:3, 23, 28, 32; 5:15, 18; 6:6; 9:2, 3; 14:10; 22:19; 23:12, 18. Num. 6:14; 28:19, 31; 29:2, 8, 13, 20, 23, 29, 32, 36. Ezek. 43:22, 23, 25; 45:18, 23; 46:4, 6, 13. Without Spot. Num. 19:2; 28:3, 9, 11; 29:17, 26. Undefiled. Ps. 119:1. This shows that Gen. 6:9 does not speak of Noah's moral perfection, but tells us that he and his family alone had preserved their pedigree and kept it pure, in spite of the prevailing corruption brought about by the fallen angels. See Ap. 23 and 25. If we read scripture Gen. 6 it tells us the (sons of god) fallen Angels were mating (marrying) the daughters of men ... Noahs blood line was pure perfect ..not defiled by this obomination to God ..this unholy union of angels and men ... It was to protect this bloodline that Christ would come through ... that God brought the flood ... Think about this through your spiritual eyes ...Noah was Perfect ... Only Christ was without sin ...This explanation doesnt work Noah was perfect ... bodily and physical perfection... God cares nothing for how the flesh body appears ..its our soul he cares about ..This explanation doesnt work Noahs bloodline was perfect.... Not defiled ..the bloodline that our savior would come through .. this would be vital ... This explanation does work.....explains there is not contradiction here or in Gods Word ... and fits with the entire picture of scripture ...