'Bitterness' in the Bible

For I see that you are in the gall of bitterness and in the bondage of iniquity.”

“Whose mouth is full of cursing and bitterness”;

Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice.

See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled;