ignoramus
/ˌɪɡnəˈreɪməs
/noun (plural ignoramuses)
An ignorant or stupid person: assume that your examiner is an ignoramus and explain everything to him...
- And the masses - stupid ignoramuses that we are - fell for it.
- He is a cretin's cretin, a halfwit, an ignoramus in every respect.
- Isn't it a shame that we have these key people doing important things who are either incompetent ignoramuses or dumb as posts?
Origin
Late 16th century (as the endorsement made by a grand jury on an indictment considered backed by insufficient evidence to bring before a petty jury): Latin, literally 'we do not know' (in legal use 'we take no notice of it'), from ignorare (see ignore). The modern sense may derive from the name of a character in George Ruggle's Ignoramus (1615), a satirical comedy exposing lawyers' ignorance.