Here are some synonyms for mischievous:
* Naughty
* Prankish
* Impish
* Waggish
* Roguish
* Tricky
* Rascal
* Scamp
Examples:
* The mischievous child giggled as he pulled his sister's pigtails.
* The mischievous cat batted the ball of yarn around the room.
* She gave him a mischievous wink.
"Mischievous" can be used to describe a person, an animal, or even an action. It often implies a sense of harmless fun, but it can also suggest a tendency to cause trouble or disrupt the peace.