Abstract: Expressivism — the sophisticated contemporary incarnation of the noncognitivist research program of Ayer, Stevenson, and Hare — is no longer the province of metaethicists alone. Its comprehensive view about the nature of both normative language and normative thought has also recently been applied to many topics elsewhere in philosophy. Yet the semantic commitments of expressivism are still poorly understood and have not been very far developed. Expressivists have not yet even managed to solve the ‘negation problem’ — to explain why atomic normative sentences are inconsistent with their negations. As a result, it is far from clear that expressivism even could be true. This book evaluates the semantic commitments of expressivism by showing how an expressivist semantics would work, what it can do, and what kind of assumptions would be required, in order for it to do it. Building on a highly general understanding of the basic ideas of expressivism, it argues that expressivists can solve the negation problem — but only in one kind of way. It shows how this insight paves the way for an explanatorily powerful, constructive expressivist semantics, which solves many of what have been taken to be the deepest problems for expressivism, including making unprecedented progress in attacking the well-known Frege-Geach problem for noncognitivist theories. But it also argues that any account which can attain these advantages will face further, even more formidable, obstacles. Expressivism, it is argued, is coherent and interesting, but false.

Keywords: noncognitivism, semantics, Frege-Geach problem, metaethics