Source : Webster's Revised Unabridged Dictionary (1913)

Naughtiness \Naugh"ti*ness\, n.
   The quality or state of being naughty; perverseness; badness;
   wickedness.

         I know thy pride, and the naughtiness of thine heart.
                                                  --1 Sam. xvii.
                                                  28.

Source : WordNet®

naughtiness
     n : an attribute of mischievous children [syn: {mischievousness},
          {badness}]