プログレッシブ和英中辞典(第4版)の解説
おやふこう【親不孝】
unfilial behavior，《英》 unfilial behaviour；〔親に従わないこと〕disobedience towards one's parents
親不孝する treat one's parents disrespectfully
あんな親不孝な奴もいない
〔親を尊敬しない〕No one is as disrespectful to his parents as that fellow.／〔親を大事にしない〕No one neglects his parents as much as he does.／〔親に心配をかける〕No one could cause his parents as much pain as he does.
親不孝者
an unfilial child; a disobedient child; an ungrateful child