Source : Webster's Revised Unabridged Dictionary (1913)

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

            His roguish madness Allows itself to anything.
                                                  --Shak.

   2. Resembling, or characteristic of, a rogue; knavish.

   3. Pleasantly mischievous; waggish; arch.

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

Source : WordNet®

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"