 Thick terms and concepts challenge the is-ought gap only if they are evaluative in meaning and have analytically sufficient non-evaluative application conditions. It also seems plausible that thick terms and concepts have some necessary non-evaluative application conditions. A bad act can be selfish only if it involves giving greater priority to oneself over others in some way and rude only if it causes offense, a good act can be generous only if it involves giving to others out of one’s own resources. An argument offered by John McDowell is often interpreted as showing that there can be no non-evaluative description that is both necessary and sufficient for the application of a thick term and, moreover, that this bears on whether the evaluative and non-evaluative aspects of thick terms and concepts are separable into distinct components (Williams 1985: 140–1; Dancy 1995; Kirchin 2010).