1. wayward but not malicious behaviour, usually of children, that causes trouble, irritation, etc
2. a playful inclination to behave in this way or to tease or disturb
3. injury or harm caused by a person or thing
4. a person, especially a child, who is mischievous
5. a source of trouble, difficulty, etc
Ultimate virtue of kittens
And children alike
Delicious sin for adults.