Meaning
A dunce — a stupid, slow, or ignorant person, especially one who does badly at school or 'caan learn'. 'Dunce head' is a common insult and taunt, and 'dunce' as an adjective describes the failing pupil or the fool. It carries the sting of the classroom, where being called dunce is a shame, and it runs through everyday talk, schoolyard teasing, and even dancehall debates about valuing education over being a 'dunce'.
Examples
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Study yuh book, nuh grow up a dunce head.
Study your book, don't grow up a dunce.
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Dem tease him seh him dunce.
They teased him that he's a dunce.
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Mi nah mek dem call mi dunce head.
I won't let them call me a dunce.
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Nuh act like a duncehead, study yuh book.
Don't act like a dunce; study your books.
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Him fail cause him a duncehead inna class.
He failed because he's a dunce in class.
Origin
From 'dunce' + 'head'; a stupid/ignorant person, esp. at school. See Chupid.
How it’s used
A dunce; a stupid/slow person, esp. one failing at school. See Chupid, Eediat.