An insult for a stupid or foolish person who doesn't think clearly or understand things well.
Compound word combining 'block' (a solid piece of material) and 'head,' implying a head as empty and useless as a solid block of wood.
This insult works because it's so vivid—calling someone a 'blockhead' is like saying their head is made of solid wood with nothing inside, which is why it's been a popular insult since at least the 1600s!
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