Definition of わるさ
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(n) badness; mean mischief
親がいないとどうしようもないほど悪さをする子供たちもいるものだ。
Some children are as bad as they can be while their parents are gone.
親がいないとどうしようもないほど悪さをする子供たちもいるものだ。
Some children are as bad as they can be while their parents are gone.