mischievousness - noun

an attribute of mischievous children

the trait of behaving like an imp

reckless or malicious behavior that causes discomfort or annoyance in others

mischievousness - thesaurus

badness   devilment   devilry   deviltry   impishness   mischief   naughtiness   puckishness   rascality   roguery   roguishness   shenanigan   whimsicality