'Enemy' in the Bible

And they brought the head of Ishbosheth unto David to Hebron, and said to the king, Behold the head of Ishbosheth the son of Saul thine enemy, which sought thy life; and the LORD hath avenged my lord the king this day of Saul, and of his seed.

When Joab was besieging the city, he put Uriah in the place where he knew the best enemy soldiers were.

But David said, "What do we have in common, you sons of Zeruiah? You are like my enemy today! Should anyone be put to death in Israel today? Don't you realize that today I am king over Israel?"

He delivered me from my strong enemy, and from them that hated me: for they were too strong for me.

Gad went to David and told him, "Shall seven years of famine come upon your land? Or shall you flee for three months from your enemy with him in hot pursuit? Or shall there be three days of plague in your land? Now decide what I should tell the one who sent me."