clueless
adjective informal uk/ˈkluː.ləs/ us/ˈkluː.ləs/
无线索的;一无所知的;一窍不通的
having no knowledge of something, or of things in general
Most people are completely clueless about tide directions and weather conditions. 大多数人对潮汐的方向和天气状况一无所知。
Synonyms: benighted ignorantilliterate unenlighteneduninformed