Maybe it has something to do with phrenology. Then again, I'd say Hitler or Pol Pot were way more evil and than the Blockheads, and their heads were (as far as I know) relatively round.
Block"head` (), n. [Block + head.]
A stupid fellow; a dolt; a person deficient in understanding.
The bookful blockhead, ignorantly read, With loads of learned lumber in his head. Pope.
© Webster 1913.
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