roguishly

from WordNet (r) 3.0 (2006)

roguishly
    adv 1: like a dishonest rogue; "he roguishly intended to keep
           the money"
    2: in a playfully roguish manner; "he winked at her roguishly"

from The Collaborative International Dictionary of English v.0.48

Roguish \Rogu"ish\, a.
   1. Vagrant. [Obs.] --Spenser.
      [1913 Webster]

            His roguish madness
            Allows itself to anything.            --Shak.
      [1913 Webster]

   2. Resembling, or characteristic of, a rogue; knavish.
      [1913 Webster]

   3. Pleasantly mischievous; waggish; arch.
      [1913 Webster]

            The most bewitching leer with her eyes, the most
            roguish cast.                         --Dryden.
      [1913 Webster] -- {Rogu"ish*ly}, adv. -- {Rogu"ish*ness},
      n.
      [1913 Webster]