dunce
From Longman Dictionary of Contemporary EnglishRelated topics: Schoolduncedunce /dʌns/ noun [countable] old-fashioned SESsomeone who is slow at learning things the dunce of the classExamples from the Corpusdunce• He was still the school dunce.• My flaky judgments were modest by comparison-but numerous enough to keep me hopeful of regaining the dunce cap this year.Origin dunce (1500-1600) John Duns Scotus (1266?-1308), Scottish religious thinker