noun
Refers to someone who is mentally deranged or an extreme enthusiast. The 'fanatic' sense is often used in compounds like 釣り狂者 (fishing fanatic).
彼は釣り狂者で、週末はいつも海にいる。
He is a fishing fanatic and is always at the sea on weekends.
その狂者は病院に収容された。
The insane person was admitted to the hospital.