That view was advanced in Timothy Williamson's book on this property, which asserted that "no one knows whether I am thin."  
The earliest explorations of this philosophical property are attributed to Eubulides of Miletus.  One modern attempt to deal with this property adheres to the principle of least mutiliation and rejecting the notion of bivalent truth; this view is known as "supervaluation."  Another approach to considering this property, called epistemicism, holds that there is some cutoff that is fundamentally unknowable. That view was advanced in Timothy Williamson's book on this property, which asserted that "no one knows whether I am thin."  Responsible for the sorities paradox or the paradox of the heap, for 10 points, identify this property defined by C.S. Peirce as what happens when a concept's meaning is intrinsically uncertain.
The earliest explorations of this philosophical property are attributed to Eubulides of Miletus.  
vagueness (do not accept ambiguity)