without understanding [those who have so long seared their consciences as to be unable to determine between right and wrong even in plain cases. The loss of moral understanding is very apparent among habitual liars, whose minds have become so accustomed to falsehood that they are no longer able to discern the truth so as to accurately state it], covenant-breakers [those who fail to keep their promises and agreements], without natural affection [those having an abnormal lack of love towards parents, children, kindred, etc.], unmerciful :

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Old Testament