Слово встречается в следующем контексте:

You are a decent person, who generally strives to do the right thing. But you have a little evil streak that sometimes shows its face. Usually, this tiny villain only expresses itself in small or petty misdemeanors and mischievous acts, and because of this you aren’t a huge threat to the wellbeing and goodness of humanity. But in a way, your impishness is even more dangerous because it can be charming, entertaining, and even amusing. So we have to keep a careful eye on you to make sure that little devil stays under control.

Заранее спасибо

Может - "шаловливость"?

лучше уйти от дословности и как-то поиграть с "вашим внутренним бесенком"