Cora Diamond on the concept of ethics

Abstract Is ethics about anything? Cora Diamond has famously argued that ethics lacks a subject matter by providing a variety of examples of ethical discourse, which, she claims, are ethically significant without being about anything ethical. They do not have a moral subject matter, but are nonetheless instances of moral thinking. This raises the question what it means for a piece of discourse to be moral. What does Diamond mean by the concept of ethics? Diamond never gives this question a direct answer, which is a cause for concern, among other things because there is reason to worry that any workable account of the concept of ethics will lead back to the idea that ethics has a subject matter. I explain how this worry can be averted by construing the concept of ethics as a family resemblance concept.