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.
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   2. Resembling, or characteristic of, a rogue; knavish.
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   3. Pleasantly mischievous; waggish; arch.
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            The most bewitching leer with her eyes, the most
            roguish cast.                         --Dryden.
      [1913 Webster] -- Rogu"ish*ly, adv. -- Rogu"ish*ness,
      n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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