'Enmity' in the Bible

I will put enmity between you and the woman, and between your offspring and her offspring. He will bruise your head, and you will bruise his heel."

or in enmity struck him with his hand, so that he died; he who struck him shall surely be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meets him.

"'But if he thrust him suddenly without enmity, or hurled on him anything without lying in wait,

Thus says the Lord Yahweh: Because the Philistines have dealt by revenge, and have taken vengeance with despite of soul to destroy with perpetual enmity;

Because you have had a perpetual enmity, and have given over the children of Israel to the power of the sword in the time of their calamity, in the time of the iniquity of the end;

You adulterers and adulteresses, don't you know that friendship with the world is enmity with God? Whoever therefore wants to be a friend of the world makes himself an enemy of God.