A British dialect term for a blockhead or stupid person, sometimes spelled 'grout-noll.'
From 'grout' (a foolish person, from Old English origins) combined with 'noll,' an archaic word for 'head' or 'skull,' possibly from Latin 'nollus.' The compound literally meant 'a head filled with grout (mud/foolishness).'
This wonderfully creative insult shows how medieval English speakers literally combined 'mud' and 'head' to call someone dumb—it's like calling someone a 'dumbbell' but actually invented 500 years earlier.
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