#stupidity  a poor ability to understand or to profit from experience
  exclusion:  intelligence
  supertype:  inability  lack of ability (especially mental ability) to do something
  subtype:  dumbness__denseness__densenes__slowwittednes  the quality of being mentally slow and limited
  subtype:  dulness__dulnes__dullnes__obtuseness  the quality of being slow to understand
  subtype:  mental_retardation__retardation__backwardness__slowness__subnormality  lack of normal development of intellectual capacities
     subtype:  mental_defectiveness__abnormality  retardation sufficient to fall outside the normal range of intelligence
        subtype:  feeblemindedness  severe mental deficiency
     subtype:  moronity__mental_deficiency  mild mental retardation
     subtype:  idiocy__amentia  extreme mental retardation
     subtype:  imbecility  retardation more severe than a moron but not as severe as an idiot
  subtype:  folly__foolishness__foolishnes__crazines  the quality of being rash and foolish

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