A source of calamity or evil; an incorrigible and wicked person, often traditionally referring to a troublesome son.
那个沉迷赌博的家伙，不仅败光了家产，还连累家人背负巨债，真是家中的孽根祸胎
That fellow, addicted to gambling, not only squandered the family fortune but also burdened his family with huge debts, truly the root of calamity for the household.
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