The Collaborative International Dictionary of English v.0.48:

Knavery \Knav"er*y\, n.; pl. Knaveries.
   1. The practices of a knave; petty villainy; fraud; trickery;
      a knavish action.
      [1913 Webster]

            This is flat knavery, to take upon you another man's
            name.                                 --Shak.
      [1913 Webster]

   2. pl. Roguish or mischievous tricks. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

knavery
    n 1: lack of honesty; acts of lying or cheating or stealing
         [syn: dishonesty, knavery]