精神失常的人。
英语:madman, 疯人 [fēng zi]1. lunatic2. madman
loony, loco, kook, nutcase, maniac, nut(cover), crackpot, crackbrain, ding-a-ling, bedlamite, psychotic, nutter, the insane, looney, luny
They must think you are a madman if you tell them you want to cross the Pacific on a raft.
A madman mutilated the painting by cutting holes in it.