'Genuinely' in the Bible

Just as ritual circumcision cuts away the foreskin as an external symbol of dedicated covenant commitment, you must genuinely dedicate yourselves to the Lord and get rid of everything that hinders your commitment to me, people of Judah and inhabitants of Jerusalem. If you do not, my anger will blaze up like a flaming fire against you that no one will be able to extinguish. That will happen because of the evil you have done."