 The comparisons between being true, being a game, and being a mammal are suggestive, but they still do not nail down exactly what it means to say that truth is not a substantive property. The contemporary literature on deflationism contains several different approaches to the idea. One such approach, which we will consider in detail in Section 4.1, involves denying that truth plays an explanatory role. Another approach, pursuing an analogy between being true and existing, describes truth as a “logical property” (for example, Field 1992, 322; Horwich 1998a, 37; Künne 2003, 91). A further approach appeals to  David Lewis’s  (1983, 1986) view that, while every set of entities underwrites a property, there is a distinction between sparse, or natural, properties and more motley or disjointed abundant properties. On this approach, a deflationist might say that there is an abundant property of being true rather than a sparse one (cf. Edwards 2013, Asay 2014, Kukla and Winsberg 2015, and Armour-Garb forthcoming). A different metaphysical idea may be to appeal to the contemporary discussion of grounding and the distinction between groundable and ungroundable properties. In this context, a groundable property is one that is capable of being grounded in some other property, whether or not it is in fact grounded; an ungroundable property is a property that is not groundable (see Dasgupta 2015, 2016 and Rabin 2020). From this point of view, a deflationist might say that being true is an ungroundable property. Hence it is unlike ordinary, sparse/natural properties, such as being iron, which are both capable of being grounded and are grounded, and it is also unlike fundamental physical properties, such as being a lepton, which are capable of being grounded (in some other possible world) but are not (actually) grounded. We will not try to decide here which of these different views of properties is correct but simply note that deflationists who want to claim that there is a truth property, just not a substantive one, have options for explaining what this means.