- a man who is mentally ill.；an extremely foolish or reckless person
noun: madman, plural noun: madmen
- 1. a man who is mentally ill.
- ▪ an extremely foolish or reckless person car got out of control—some madman going too fast
- ▪ used in similes to refer to a person who does something very fast, intensely, or violently I was working like a madman
- a man who is mentally ill.
Oxford American Dictionary