imbecility

Noun
  1. Retardation more severe than a moron but not as severe as an idiot (synset 105654860)
    is a type of: backwardness, mental retardation, retardation, slowness, subnormality - lack of normal development of intellectual capacities
  2. A stupid mistake (synset 101250622)
    is a type of: error, fault, mistake - a wrong action attributable to bad judgment or ignorance or inattention
    same as: betise, folly, foolishness, stupidity

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