What's "mischievous" mean?

Native speaker’s answer
Rebecca
"Mischievous" is an adjective that means one who causes trouble and misbehaves in a playful way. It can also means one who intends to cause trouble or harm, which is how it's used here. Here it's used to describe Bruno's grin but also implies that he's mischievous himself. Ex: The main character is very mischievous, and she gets everyone else in trouble. Ex: My toddler is quite mischievous. He always tries to get the cookies on the kitchen counter when I'm not looking.