"mischiefs" in the noun sense
1. mischief, mischief-making, mischievousness, deviltry, devilry, devilment, rascality, roguery, roguishness, shenanigan
reckless or malicious behavior that causes discomfort or annoyance in others
2. maleficence, mischief, balefulness
the quality or nature of being harmful or evil
Source: WordNet® (An amazing lexical database of English)
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