The Hebrew word tamim means without blemish. It is not to describe moral perfection, but physical perfection.
It is rendered without blemish in:
Exodus 12:5, Ch. 29:1.
Leviticus 1:3, 10; Ch. 3:1, 6; Ch. 4:3, 23, 38, 32; Ch. 5:15, 18; Ch. 6:6, 9:2, 3; Ch. 14:10; Ch. 22:19; Ch. 23:12, 18.
Numers 6:14; Ch. 28:19, 31; Ch. 29:2, 8, 13, 20, 23, 29, 32, 36.
Ezekiel 43:22, 23, 25; Ch. 45;18, 23; Ch. 46:4, 6, 13.
Without spot: Numbers 19:2; Ch. 28:3, 9, 11; Ch. 29:17, 26.
Undefiled: Psalms 119:1.
This proves that Genesis 6:9 does not speak of Noah's moral perfection. Instead, Noah and his family had preserved their pedigree and kept it pure, in spite of the prevailing corruption brought about by the fallen angels.
