他竟然厚颜无耻地要求我为他昨晚的粗鲁行为道歉。

He had the ___effrontery to ask me to apologize for his rude behavior last night.

她竟然在公开场合反驳老师，真是厚颜无耻。

Her ___effrontery to contradict the teacher in public was unbelievable.