All men, as the word flesh is taken, Psalms 78:39 Isaiah 40:5, and oft elsewhere, had corrupted his way; either,
1. God's way, his precepts concerning religion and righteousness; or,
2. Their own way or manner of living.
Related Commentaries of Genesis 6:12
Genesis 6:12
12 And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth.