Vocabulary What does 悪さ (わるさ, warusa) mean? 悪さ (わるさ, warusa) means badness; mean mischief. Quick factsReadingわるさRomajiwarusaPart of speechnoun 悪さわるさwarusabadness; mean mischief1noun badness; mean mischiefKanji in this word悪bad, evil, wicked