'Enemy' in the Bible

and bring in the head of Ish-Bosheth unto David in Hebron, and say unto the king, 'Lo, the head of Ish-Bosheth, son of Saul, thine enemy, who sought thy life; and Jehovah doth give to my lord the king vengeance this day, of Saul and of his seed.'

He delivereth me from my strong enemy, From those hating me, For they were stronger than I.