ig ‧ no ‧ ra ‧ mus /ˌɪɡnəˈreɪməs/ BrE AmE noun ( plural ignoramuses ) [countable] old-fashioned
[ Date: 1500-1600 ; Language: Latin ; Origin: 'we do not know' , from ignorare ; ⇨ ↑ ignore ]
someone who does not know about things that most people know about