'Bitterness' in the Bible

The priest shall then have the woman stand before the Lord and let the hair of the woman’s head go loose, and place the grain offering of memorial in her hands, which is the grain offering of jealousy, and in the hand of the priest is to be the water of bitterness that brings a curse.

The priest shall have her take an oath and shall say to the woman, “If no man has lain with you and if you have not gone astray into uncleanness, being under the authority of your husband, be immune to this water of bitterness that brings a curse;

‘The priest shall then write these curses on a scroll, and he shall wash them off into the water of bitterness.

and he shall cause the woman to drink the bitter water that bringeth the curse, that the water that bringeth the curse may enter into her for bitterness.

And when he hath made her to drink the water, then it shall come to pass, if she have been defiled, and have committed unfaithfulness against her husband, that the water that bringeth the curse shall enter into her, for bitterness, and her belly shall swell, and her thigh shall shrink; and the woman shall become a curse among her people.