'Enemy' in the Bible

And they brought the head of Ishbosheth to David in Hebron, and said to the king, Behold the head of Ishbosheth the son of Saul, thine enemy who sought thy life; and Jehovah has given to my lord the king to be avenged this day of Saul and of his seed.

He delivered me from my strong enemy, From them that hated me; For they were mightier than I.