This appeal to prima facie obligations has been challenged. What is distinctive of a prima facie obligation, as opposed to a mere instrumental means-end imperative, is that it cannot be overridden by mere desires. However, it is argued, if \(S\) has no desire to speak the truth, then \(S\) has no obligation to apply “green” to green objects. For instance, if neither \(S\), nor her audience, care whether \(S\) tells the truth, then there is no obligation to apply “green” correctly. Hence, (CM)