compunction
/kəmˈpʌŋkʃ(ə)n/If you say that someone has no compunction about doing something, you mean that they do it without feeling ashamed or guilty. 悔恨
noun [抽象名词] 悔恨,后悔;内疚
He has no compunction about relating how he killed his father. 他毫无悔意地讲述了他如何杀死自己的父亲。