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
  1. noun
    a poor ability to understand or to profit from experience
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    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
  2. noun
    a stupid mistake
    synonyms: betise, folly, foolishness, imbecility
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    type of:
    error, fault, mistake
    a wrong action attributable to bad judgment or ignorance or inattention
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