The Oxford Thesaurus An A-Z Dictionary of Synonyms - mischiefn.

1) misbehaviour, naughtiness, impishness, elfishness or elvishness, roguishness, rascality, devilry or deviltry, mischievousness, playfulness, devilment, badness, Colloq monkey business, shenanigans, Brit monkey tricks or US monkeyshines: That boy is always up to some mischief. 2) harm, injury, damage, detriment, trouble, hurt, wrong, difficulty, disruption, destruction, misfortune, evil: He didn't realize the mischief a casual remark could do. She was accused of malicious mischief when she punctured his car tyres.