"mischievousness" in the noun sense
1. naughtiness, mischievousness, badness
an attribute of mischievous children
2. impishness, mischievousness, puckishness, whimsicality
the trait of behaving like an imp
3. mischief, mischief-making, mischievousness, deviltry, devilry, devilment, rascality, roguery, roguishness, shenanigan
reckless or malicious behavior that causes discomfort or annoyance in others
Source: WordNet® (An amazing lexical database of English)
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