undutiful /ʌnˈdjuːtɪfʊl/ CET6

• 1. 

  ADJ If you say that someone is undutiful, you mean that they do not show respect or behave as they are expected to. 不恭敬的; 不本分的 [正式] [表不满]

  例：

  They were looking into the King's coach in a most undutiful manner.

  他们极其没有礼貌地向那位国王的车厢里观望。