stupidity
n.-
1 lack of intelligence (n.) B1 Intermediatethe state of being stupid or lacking good sense.
the abstract quality of lacking intelligence, judgment, or common sense.
ExampleHe was shocked by the sheer stupidity of the decision to close the school.
ExampleThe critic argued that the film's plot relied entirely on the characters' stupidity rather than any genuine dramatic tension.
UsageUncountable in this sense.
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2 a foolish act (n.) B2 Upper Intermediatea specific action or mistake that is stupid.
a particular act, remark, or decision that demonstrates a lack of intelligence.
ExampleI have committed many stupidities in my life, but that was the worst.
ExampleThe memoir is a candid account of the various stupidities the author committed during his reckless youth in Paris.
UsageCountable in this sense; often used in the plural to describe a series of mistakes.
From Latin stupiditātem, accusative of Latin stupiditās, equivalent to stupid + -ity.