Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: 'we do not know', from ignorare; IGNORE

ignoramus

 noun
     
ig‧no‧ra‧mus plural ignoramuses [countable] old-fashioned
someone who does not know about things that most people know about
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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