Definition of ずる賢い
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(adj-i) devious; cunning; sly; crafty
彼はとてもずる賢いので私は嫌いだ。
I don't like him because he is sly as a fox.
彼はとてもずる賢いので私は嫌いだ。
I don't like him because he is sly as a fox.