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®

roguishness
     n 1: the trait of indulging in disreputable pranks [syn: {prankishness},
           {rascality}]
     2: reckless or malicious behavior that causes discomfort or
        annoyance in others [syn: {mischief}, {mischief-making}, {mischievousness},
         {deviltry}, {devilry}, {devilment}, {rascality}, {roguery},
         {shenanigan}]