Elisa Paganini

Vagueness manifests itself (among other things) in our inability to find boundaries to the extension of vague predicates. A semantic theory of vagueness plans to justify this inability in terms of the vague semantic rules governing language and thought. According to a supporter of semantic theory, the inability to find such a boundary is not dependent on epistemic limits and an omniscient being like God would be equally unable. Williamson (Vagueness, 1994 ) argued that cooperative omniscient beings adequately instructed would find a precise boundary in a sorites series and that, for this reason, the semantic theory misses its target, while Hawthorne (Philosophical Studies 122:1–25, 2005 ) stood with the semantic theorists and argued that the linguistic behaviour of a cooperative omniscient being like God would clearly demonstrate that he does not find a precise boundary in the sorites series. I argue that Hawthorne’s definition of God’s cooperative behaviour cannot be accepted and that, contrary to what has been assumed by both Williamson and Hawthorne, an omniscient being like God cannot be a cooperative evaluator of a semantic theory of vagueness

Williams (2012) recently proposed the Normative Silence model of Indeterminacy in order to account for a single phenomenon running through all cases of indeterminacy and to reach consensus on the correct epistemic attitude to adopt towards borderline cases of paradigmatically vague predicates. Williams’s Normative Silence model says there is no general normative rule governing God’s and humans’ belief attitudes towards indeterminacies. I claim instead that human rationality and philosophical inquiry require general normative rules leading our belief attitudes towards indeterminacies and that God’s belief attitudes are more difficult to define than Williams assumes.