lu·na·tic /ˈluːnətɪk/ noun [countableC] 1 CRAZYsomeone who behaves in a crazy or very stupid way – often used humorously 疯狂的人,愚笨的人〔常为幽默用法〕 This hotel is run by a lunatic! 经营这家宾馆的人真是个疯子!
2 old-fashionedMENTALLY ILL a very offensive word for someone who is mentally ill 精神错乱的人,疯子〔极具冒犯性的用语〕 a dangerous lunatic 危险的精神病人
3. the lunatic fringe British EnglishBrEPPG the small group of people in a political group or organization who have the most extreme opinions or ideas 〔政治团体或组织中的〕极端分子
—lunatic adjectiveadj [only before noun]