Most people think the word above is pronounced miss-cheev-ee-ous, or miss-cheev-ous. Wrong. And annoying.
Mischievous should be pronounced miss-chiv-ous. It’s an adjective to describe someone or something designed to cause trouble.
Mrs Greaves had a mischievous streak and enjoyed deliberately marking students late for mentor time even if they were there bang the bell.
Why not try using it in your writing or when talking to others? Providing you pronounce it correctly, of course!