noun, noun which may take the genitive case particle 'no'
lunatic; madman; insane person
Refers to a person who is mentally deranged or acts in a wildly irrational way. Can be used literally or figuratively.
彼はまるで狂人のように叫び続けた。
He kept screaming like a madman.
その狂人は病院に収容された。
The lunatic was confined to a hospital.