Synonyms for Deviltry (same or very similar meaning)
WordNet sense 1 (wicked and cruel behavior):
DevilryWordNet sense 2 (reckless or malicious behavior that causes discomfort or annoyance in others):
devilment, mischief, mischievousness, roguery, roguishness, shenanigan, mischief-making, rascalityFrom the ODE community, based on WordNetadd/edit