The Collaborative International Dictionary of English v.0.48:

Devilry \Dev"il*ry\, n.; pl. Devilries.
   1. Conduct suitable to the devil; extreme wickedness;
      deviltry.
      [1913 Webster]

            Stark lies and devilry.               --Sir T. More.
      [1913 Webster]

   2. The whole body of evil spirits. --Tylor.
      [1913 Webster]

WordNet (r) 3.0 (2006):

devilry
    n 1: wicked and cruel behavior [syn: deviltry, devilry]
    2: reckless or malicious behavior that causes discomfort or
       annoyance in others [syn: mischief, mischief-making,
       mischievousness, deviltry, devilry, devilment,
       rascality, roguery, roguishness, shenanigan]