- 1[uncountable, countable, usually plural] behavior that shows a lack of thought or good judgment I couldn't believe my own stupidity. the errors and stupidities of youth The police were astonished at the sheer stupidity of drivers in going so fast in the fog.
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- 2[uncountable] the state or quality of being slow to learn and not intelligent He faked stupidity to try to escape punishment for the crime.
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