 One way for thick and thin to differ in kind would be for thin terms express purely evaluative concepts and for thick terms to express concepts that aren’t purely evaluative but encode also non-evaluative information. An early version of this proposal is due to Bernard Williams: thin terms are wholly action-guiding whereas thick terms are both action-guiding and world-guided (Williams 1985: 152). His particular version is problematic: the notion of action-guidingness isn’t as clear as one would like and many philosophers take also thin terms to be world-guided in the sense that their application depends on how the world is. (For a more recent version, see Dancy 2013: 47–51.) In its general form, this proposal presupposes the Semantic View but is available to both Separabilists and Inseparabilists. Similarly, although Williams denies Thin Centralism concerning the relations of conceptual and explanatory priority between thick and thin concepts, the general proposal could be combined with Thin Centralism or the No Priority view. A potential problem for it is that it isn’t clear whether all paradigmatic thin concepts are wholly evaluative, given the intuitive idea that thick terms are those that somehow involve both evaluation and non-evaluative description. If ought implies can as a conceptual or analytic matter, then its application will be restricted by the non-evaluative condition that the agent is able to perform the action (Väyrynen 2013: 7). In that case ought wouldn’t look descriptively much thinner than some terms that are often classified as thick. The application of admirable, for instance, is non-evaluatively constrained only by the non-evaluative features of admiration. As noted in  section 3.2,  not all entailments of an expression are encoded in its meaning and it isn’t straightforward to determine which are. But competence with at least certain concepts ought can be used to express may well require that if we think you ought to do something, we would accept that you can do it if the question came up.