'Bitterness' in the Bible

For I see that thou art in the gall of bitterness and in the bond of iniquity.

Whose mouth is full of cursing and bitterness:

Let all bitterness, and wrath, and anger, and clamor, and railing, be put away from you, with all malice:

looking carefully lest there be any man that falleth short of the grace of God; lest any root of bitterness springing up trouble you , and thereby the many be defiled;