调皮 (tiáo pí): naughty, mischievous

When my younger brother was little, he was very naughty and often took toys apart completely, leaving Mom not knowing whether to laugh or cry.

This kitten is very naughty; it always loves to jump onto the desk and bat at my pen with its paws.

These children were so naughty that while Grandpa was taking a nap, they quietly drew a pair of glasses on his face.