If you describe a phrase as an oxymoron, you mean that what it refers to combines two opposite qualities or ideas and therefore seems impossible. 矛盾修饰法
noun [抽象名词](修辞中的)矛盾修饰法
This has made many Americans conclude that business ethics is an oxymoron. 这使许多美国人将商业道德归为一种矛盾修饰法。