Albert Barnes Commentary 1 Samuel 20:30

"Then Saul`s anger was kindled against Jonathan, and he said unto him, Thou son of a perverse rebellious woman, do not I know that thou hast chosen the son of Jesse to thine own shame, and unto the shame of thy mother`s nakedness?" — 1 Samuel 20:30 (ASV)

The greatest insult and most stinging reproach that can be leveled against someone in the ancient Near East is to dishonor their parents or ancestors . Saul means to imply that Jonathan was stubborn from his mother’s womb.