'Unfaithfulness' in the Bible

Speak unto the children of Israel, When a man or woman shall commit any of all the sins of man to work unfaithfulness against Jehovah, and that soul is guilty,

Speak unto the children of Israel, and say unto them, If any man's wife go astray, and commit unfaithfulness against him,

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.