maniac
/ˈmeɪniæk/
noun
- A person who behaves in a wild, violent, or extremely enthusiastic way.
- The movie villain was portrayed as a dangerous maniac with no remorse.
- The driver was a maniac, weaving through traffic at high speed.
- He's a maniac when it comes to video games, playing for twelve hours straight.
adjective
- Wildly enthusiastic or obsessed with something.
- The maniac crowd cheered nonstop throughout the entire game.
- She's a maniac fan of that band and has seen them in concert twenty times.
- My brother is maniac about keeping his car spotless.