Source : Webster's Revised Unabridged Dictionary (1913)

Wiliness \Wi"li*ness\, n.
   The quality or state of being wily; craftiness; cunning;
   guile.

Source : WordNet®

wiliness
     n : shrewdness as demonstrated by being skilled in deception
         [syn: {craft}, {craftiness}, {cunning}, {foxiness}, {guile},
          {slyness}]