The Collaborative International Dictionary of English v.0.48:

Devilment \Dev"il*ment\, n.
   Deviltry. --Bp. Warburton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "devilment":
   aggravation, annoyance, bad news, bedevilment, bitchiness, bore,
   bother, botheration, bothersomeness, crashing bore, cussedness,
   devilishness, devilry, deviltry, diablerie, difficulty, dogging,
   downer, drag, elfishness, evil intent, exasperation, foolishness,
   harassment, harmfulness, harrying, hatefulness, headache,
   high spirits, hounding, impishness, iniquitousness, invidiousness,
   maleficence, malice, malice aforethought, malice prepense,
   maliciousness, malignance, malignancy, malignity, meanness,
   mischief, mischievousness, molestation, nastiness, noxiousness,
   nuisance, orneriness, persecution, pest, playfulness, prankishness,
   pranksomeness, problem, puckishness, roguery, roguishness,
   scampishness, sportiveness, trial, trouble, vexation,
   vexatiousness, waggery, waggishness, wickedness, worriment, worry,
   youthful spirits