To feign virtue and knowledge while engaging in deceitful or immoral practices; to be a hypocrite who preaches one thing and does another.
他总是把仁义道德挂在嘴边，却常做些损人利己的勾当，真是诗书发冢。
He always talks about benevolence and morality, yet often engages in activities that harm others for his own benefit, truly a case of "robbing graves with scholarly pretense."
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