悪わるいたずら

noun

mischief; prank; naughty trick

Refers to playful but potentially harmful or annoying tricks, often done by children or with a slightly malicious intent.

• 弟おとうとがまた悪わるいたずらをして、母ははに叱しかられた。

  My little brother played another prank and got scolded by Mom.

• それはただの悪わるいたずらではなく、犯はん罪ざいだ。

  That's not just a prank; it's a crime.