lunatic

lunatic
noun
  1. a person who is mentally ill (not in technical use)
    精神病患者,疯子(非技术用语)
    ■an extremely foolish or eccentric person
    极端愚蠢的人;狂人
    this lunatic just accelerated out from the side of the road.
    这个蠢货就从路边加速冲了出来。
adjective
  1. [attrib.]mentally ill (not in technical use)
    疯狂的(非技术用语)
    ■extremely foolish, eccentric, or absurd
    极端愚蠢的;古怪的;荒谬的
    he would be asked to acquiesce in some lunatic scheme.
    他会被要求默许某个荒唐的计划。
语源
  1. Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna 'moon' (from the belief that changes of the moon caused intermittent insanity)
英语宝典
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