A stupid or dull-witted person; someone with a head as lumpy and slow as a clod of earth.
A compound word from 'clod' (lump of earth, or metaphorically, a stupid person) and 'head' (the seat of intelligence). This Old English/Middle English combination creates a simple, vivid insult comparing someone's intellect to soil.
Medieval insults loved compound words—'clodhead' is direct and visual, literally suggesting someone's brain is made of dirt, which is way more creative than just saying 'idiot!'
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