 Despite these complications in characterizing thick terms and concepts, they are widely agreed to be of potentially high significance. An important assumption in many metaethical debates is that the evaluative and the non-evaluative can be sharply distinguished. If the evaluative and non-evaluative aspects of thick terms or concepts aren’t separable into distinct components, these debates may be impacted in a fundamental way. Starting with some prominent arguments in the literature concerning the significance of thick concepts will naturally lead us to fundamental questions about their nature.