Naughtiness/ˈnɔːtinəs/ Definition 1 of 2Pro Tip 1/3Childish Play Refers to children's minor trouble-making as part of growing up. The child’s naughtiness was evident when he hid his sister's toys. Pro Tip 2/3Affectionate Tone Often used affectionately when the bad behavior is not seriously harmful. Grandma chuckled at the naughtiness of the puppy chewing her slipper. Pro Tip 3/3Not Always Cute Can be negative if the behavior causes real trouble or harm. Their naughtiness at school resulted in a call to their parents.