lunatic
noun [ C ] uk/ˈluː.nə.tɪk/ us/ˈluː.nə.tɪk/
疯子，癫狂的人
someone who behaves in a silly or dangerous way
He drives like a lunatic. 他开车像疯子一样。
offensive old-fashioned精神病人
a person who is mentally ill
lunatic
adjective uk/ˈluː.nə.tɪk/ us/ˈluː.nə.tɪk/
疯癫的;疯狂的
silly in a dangerous way
Idiom
the lunatic fringeidiom disapproving or humorous 少数顽固派；少数极端分子
people who have very strong opinions that are outside the usual range