Source : Webster's Revised Unabridged Dictionary (1913)

Presumptuousness \Pre*sump"tu*ous*ness\, n.
   The quality or state of being presumptuous.

Source : WordNet®

presumptuousness
     n : audacious (even arrogant) behavior that you have no right
         to; "he despised them for their presumptuousness" [syn: {presumption},
          {effrontery}, {assumption}]