顽皮 (wán pí): naughty

My little brother naughtily made a face at me, then quickly ran away.

This little monkey is very naughty; it always grabs tourists' hats and puts them on its own head.

Although the neighbor's child is naughty, he never does dangerous things, so everyone likes him very much.

The teacher looked at this naughty student, shook her head helplessly, but couldn't help laughing.

The kitten naughtily chased its own tail, circling the living room round and round.