Definition from Wiktionary, the free dictionary
mischief (plural mischiefs)
- Harm or evil caused by an agent or brought about by a particular cause.
- One who causes mischief. In a milder sense, one who causes petty annoyances. mischief-maker.
- Vexatious or annoying conduct.
- 1914-1915 "I fear this means that there is some mischief afoot." — Sherlock Holmes in The Valley of Fear by Sir Arthur Conan Doyle.
- (evil): agitation, annoyance, corruption, damage, demolition, destruction, detriment, disablement, disruption, evil, harm, hurt, ill, impairment, incapacitation, injury, nuisance, pique, ravage, sabotage, scathe, trouble, undoing, unmaking, vexation, weakening, wrong
- (mischief-maker): bad boy, booger, buffoon, bugger, cutup, devil, elf, enfant terrible, fun-maker, hell-raiser, hood, hoodlum, hooligan, imp, joker, jokester, knave, life of the party, little devil, little monkey, little rascal, minx, mischief-maker, pixie, practical joker, prankster, puck, rapscallion, rascal, rogue, rowdy, ruffian, scamp, scapegrace, thug, trouble maker, vandal, wag
- (annoying conduct): bad manners, badness, delinquincy, devilishness, devilment, devilry, deviltry, disobedience, elfishness, goings-on, hanky-panky, impishness, impropriety, misbehavior, mischievousness, misconduct, misdemeanor, monkey business, naughtiness, prankishness, pranksomeness, puckishness, rascality, roguery, roguishness, scampishness
- See also Wikisaurus:villain
- See also Wikisaurus:troublemaker
Derived terms 
harm or evil caused by an agent or brought about by a particular cause
one who causes mischief
vexatious or annoying conduct
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