Error theorists and skeptics about moral truth-aptness disagree about the content of moral assertions, but they still agree that no substantive moral claim or belief is true, so they are both skeptics about moral truth. None of these skeptical theses is implied by either skepticism about moral knowledge or skepticism about justified moral belief. Some moral claims might be true, even if we cannot know or have justified beliefs about which ones are true. However, a converse implication seems to h