ignoramus, ignoramuses 1. An extremely ignorant person. 2. Someone who is ignorant, often ridiculously so; a dunce. 3. Etymology: From New Latin ignoramus, a grand jury's endorsement upon a bill of indictment when evidence is deemed insufficient to send the case to a trial jury, from Latin, 'we do not know', first person plural, present tense, of... Found on http://www.wordinfo.info/words/index/info/view_unit/929/4