1. impious toward one's parents; an undutiful son. 不孝顺父母的；不孝的儿子。
2. The research shows that coalmine managers' undutiful behavior is an important unsafe behavior and is the fundamental accident-causing factor; 研究表明：煤矿管理者的不尽职行为是一种重要的不安全行为，并成为导致我国煤矿事故频发的根本原因；
3. It might be that a sluggish bond-servant, or an undutiful child, whom his parents had given over to the civil authority, was to be corrected at the whipping-post. 也许，是一个偷懒的奴隶或是被家长送交给当局的一名逆子要在这笞刑柱上受到管教。
