  Moral skeptics differ in many ways (cf. Machuca 2017), but they share a common core that makes them all moral skeptics. What makes moral skepticism moral is that it concerns morality rather than other topics. Moral skeptics might go on to be skeptics about the external world or about other minds or about induction or about all beliefs or about all norms or normative beliefs, but these other skepticisms are not entailed by moral skepticism alone.