   An open question is one that is not closed, and a closed question is one the asking of which betrays a lack of understanding of the concepts involved. For instance, if I asked “Jones is a widow, but was she ever married?”, this would show that I don’t really understand the term “widow”. So this question is closed. Moore claims that we can test any naturalistic definition of goodness by asking whether something that has those natural properties is good, and then seeing whether this question is open or closed. If the definition is true, then the question must be closed, so if it is open, the definition must be false. 