deviltry

1. Reckless mischief.
2. Extreme cruelty; wickedness.
3. Evil magic; witchcraft.
4. An act of mischief, cruelty, or witchcraft.

[Alteration (influenced by such words as GALLANTRY) of DEVILRY.]

noun

1. Annoying yet harmless, usually playful acts: devilry, diablerie, high jinks, impishness, mischief, mischievousness, prankishness, rascality, roguery, roguishness, tomfoolery. Informal shenanigan (often used in plural). See good/bad.
2. A wicked act or wicked behavior: crime, diablerie, evil, evildoing, immorality, iniquity, misdeed, offense, peccancy, sin, wickedness, wrong, wrongdoing. See right/wrong.

The noun has 2 meanings:

Meaning #1: wicked and cruel behavior
  Synonym: devilry

Meaning #2: reckless or malicious behavior that causes discomfort or annoyance in others
  Synonyms: mischief, mischief-making, mischievousness, devilry, devilment, rascality, roguery, roguishness, shenanigan