mischievousness
Noun
Meaning
an attribute of mischievous children
reckless or malicious behavior that causes discomfort or annoyance in others
the trait of behaving like an imp
Source: WordNetSynonyms
badness
naughtiness
mischief
devilry
rascality
shenanigan
roguery
deviltry
devilment
mischief-making
roguishness
whimsicality
impishness
puckishness
injury
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Antonyms
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Examples
He has a childlike, boyish, impish, mischievousness. And I have to try and make him behave properly, like a holy man!