Expressivists hold that ethical sentences express attitudes. We argue that it is very hard for expressivists to give an account of the relevant sense of 'express' which has some plausibility and also delivers the kind of noncognitivist account of ethical sentences they affirm. Our argument draws on Locke's point that words are voluntary signs.

It is sometimes suggested that expressivism in meta-ethics is to be criticized on grounds which do not themselves concern meta-ethics in particular, but which rather concern philosophy of language more generally. Frank Jackson and Philip Pettit (1998; see also Jackson and Pettit 1999, and Jackson 2001) have recently advanced a novel version of such an argument. They begin by noting that expressivism in its central form makes two claims—that ethical sentences are not truth evaluable, and that to assert an ethical (...) sentence is to express one’s desires or feelings rather than to report a fact. They then argue that, given some plausible premises in the philosophy of language emanating mainly from Locke, the two central claims of expressivism are contradictory: when combined with the plausible premises, they say, the second claim refutes the first. The purpose of this paper is to formulate Jackson and Pettit’s Lockean argument, and to suggest that it fails. (shrink)