Genesis 6:4-6

There were Nephilim (men of stature, notorious men) on the earth in those days—and also afterward—when the sons of God lived with the daughters of men, and they gave birth to their children. These were the mighty men who were of old, men of renown (great reputation, fame). [Num 13:33] The LORD saw that the wickedness (depravity) of man was great on the earth, and that every imagination or intent of the thoughts of his heart were only evil continually. The LORD regretted that He had made mankind on the earth, and He was [deeply] grieved in His heart.