c. 1600, "pertaining to mania; insane," from French maniaque (14c.), from Late Latin maniacus, from Greek maniakos, from mania (see mania). Borrowed at first in French form; Latinized in English from 1727. The noun is attested from 1763, from the adjective.
例文
1. The cabin looked as if a maniac had been let loose there.
小屋は狂人によって野に撒かれたように見える。
2.My mum is turning into a religious maniac .
私の母は宗教マニアになっています。/
3.That man is a homicidal maniac .
あの人は殺人鬼だ。/
4.He was driving like a maniac .
彼は狂ったように運転した。
5.He drove like a maniac .We had one near miss after another.