mischief

Short definition from Wiktionary

Noun

1. 1
   Conduct that playfully causes petty annoyance.
2. 2
   A playfully annoying action.
3. 3
   A group or a pack of rats.
4. 4
   Harm or injury: Harm or trouble caused by an agent or brought about by a particular cause.
5. 5
   Harm or injury: An injury or an instance of harm or trouble caused by a person or other agent or cause.
6. 6
   A criminal offence defined in various ways in various jurisdictions, sometimes including causing damage to another's property.
7. 7
   A cause or agent of annoyance, harm or injury, especially a person who causes mischief.
8. 8
   The Devil; used as an expletive.
9. 9
   Casual and/or flirtatious sexual acts.

Verb

1. 1
   To do a mischief to; to harm.
2. 2
   To slander.