If you describe someone as an ignoramus, you are being critical of them because they do not have the knowledge you think they ought to have.
[formal, disapproval]
Synonyms: dunce, fool, ass, donkey More Synonyms of ignoramus
ignoramus in British English
(ˌɪɡnəˈreɪməs)
nounWord forms: plural-muses
an ignorant person; fool
Word origin
C16: from legal Latin, literally: we have no knowledge of, from Latin ignōrāre to be ignorant of; see ignore; modern usage originated from the use of Ignoramus as the name of an unlettered lawyer in a play by G. Ruggle, 17th-century Englishdramatist
ignoramus in American English
(ˌɪgnəˈreɪməs; ˌɪgnəˈræməs)
nounWord forms: pluralˌignoˈramuses
an ignorant and stupid person
Word origin
< the name of a lawyer in Geo. Ruggle's play Ignoramus (1615); L, lit., we take no notice (a legal term formerly written on a bill of indictmentby a grand jury that finds it to be not a true bill)
Examples of 'ignoramus' in a sentence
ignoramus
The woman might have been a perfect ignoramus, but no one could deny she was a fine player, and had the figure for it.
Fidelis Morgan THE RIVAL QUEENS: A COUNTESS ASHBY DE LA ZOUCHE MYSTERY (2002)
Lucy treated it as the ignoramus question it was and refused to answer.
Skelton, Alison Scott AN OLDER WOMAN (2002)
The truth is, probably, that Pantelaras just liked to show off his collection, even to an ignoramus like me.