madman

noun, plural mad·men [mad-men, -muh n] /ˈmædˌmɛn, -mən/.

1. a person who is or behaves as if insane; lunatic; maniac.

noun plural -men

1. a man who is insane, esp one who behaves violently; lunatic

n.early 14c., mad man, from mad (adj.) + man (n.). One-word form attested from c.1400, prevalent from 16c.