  What makes moral skeptics skeptics is that they raise doubts about common beliefs. Moral skeptics then differ in the kinds of common beliefs that they doubt. They might, for example, doubt categorical or absolute moral beliefs without doubting weaker kinds of moral beliefs. Moral skeptics also differ in the kinds of doubts that they raise. Since general skepticism is an epistemological view about the limits of knowledge or justified belief, the most central version of moral skepticism is the one that raises doubts about moral knowledge or justified moral belief.