21 Ways to Call Someone Stupid in English

source: Britlish - Linguaspectrum 2016年4月19日
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Blockhead
A block is a solid piece of wood often used as a base for chopping things. A man with a similarly dense head would thus be known as a blockhead.
What a blockhead!
Bonkers
Bonkers means not right in the head.
With all the medical evidence against it, anyone who smokes must be completely bonkers!
A clod is a dense and heavy lump of earth. A stupid person might be considered to have a similar dense lump instead of a brain.
The man's a clod!
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