lunacy
noun[U]
uk/ˈluː.nə.sɪ/us/ˈluː.nə.sɪ/stupidbehaviourthat will havebadresults:
愚蠢的行为，不明智的举动It would be lunacy totrytoclimbthemountainin thisweather.疯子才会在这样的天气去爬山。
It wassheerlunacyspendingall thatmoney.把那些钱都花光简直是愚蠢至极。
old-fashioned
mentalillness
精神病，精神错乱