'Unfaithfully' in the Bible

"Speak to the Israelites and tell them, 'If any man's wife goes astray and behaves unfaithfully toward him,

When he has made her drink the water, then, if she has defiled herself and behaved unfaithfully toward her husband, the water that brings a curse will enter her to produce bitterness -- her abdomen will swell, her thigh will fall away, and the woman will become a curse among her people.