The main thing about the duke and duchess wasn't their duplicity, but their invincible stupidity.公爵和公爵夫人的主要问题不是口是心非，而是无可救药的愚蠢。If you constantly try to make someone happy, you end up becoming submissive, saying yes when you don't really mean it.如果你总是想讨好某人，最后就会变得卑躬屈膝，口是心非。He had been devious and two-faced.他一直都阴险狡猾、口是心非。