- 1(informal) a person who behaves in an extremely dangerous, wild, or stupid way synonym madman He was driving like a maniac.
- 2a person who has an extremely strong desire or enthusiasm for something, to an extent that other people think is not normal synonym fanatic
- 3(psychology) a person suffering from mania a homicidal maniac
a maniac driver/fan/killer
maniac adjective [only before noun]jump to other results