Stupidity is the quality of being stupid. It’s the opposite of intelligence. Stupidity is responsible for many acts that follow the words, “Hey, watch this!”

Being stupid has to do with not understanding things, not learning from past experiences, and generally not using your brain, so stupidity refers to this quality. Saying that someone did something because of stupidity is an insult because it means the person really should’ve known better. Riding in a shopping cart tied to the back of a car and zinging around a parking lot would be the result of some serious stupidity.

Definitions of stupidity

n a poor ability to understand or to profit from experience

the ability to comprehend; to understand and profit from experience
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denseness, dumbness, slow-wittedness
the quality of being mentally slow and limited
dullness, obtuseness
the quality of being slow to understand
backwardness, mental retardation, retardation, slowness, subnormality
lack of normal development of intellectual capacities
craziness, folly, foolishness, madness
the quality of being rash and foolish
indicative of or marked by mental vacuity and an absence of ideas
abnormality, mental defectiveness
retardation sufficient to fall outside the normal range of intelligence
mental deficiency, moronity
mild mental retardation
amentia, idiocy
extreme mental retardation
retardation more severe than a moron but not as severe as an idiot
oscitance, oscitancy
drowsiness and dullness manifested by yawning
Type of:
lack of ability (especially mental ability) to do something

n a stupid mistake

betise, folly, foolishness, imbecility
Type of:
error, fault, mistake
a wrong action attributable to bad judgment or ignorance or inattention

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