remiss

adj.玩忽职守的

疏忽的；不负责的；懈怠的

形容词

1、He was remiss in his duties and was reprimanded by his supervisor.
他在履行职责方面疏忽了，被主管责备了。
2、I apologize for being remiss in responding to your email sooner.
对于没有及时回复你的电子邮件我表示道歉。