Source : Webster's Revised Unabridged Dictionary (1913)

Ingeniousness \In*gen"ious*ness\, n.
   The quality or state of being ingenious; ingenuity.

Source : WordNet®

ingeniousness
     n 1: the power of creative imagination [syn: {inventiveness}, {ingenuity},
           {cleverness}]
     2: the property of being ingenious; "a plot of great
        ingenuity"; "the cleverness of its design" [syn: {ingenuity},
         {cleverness}]