#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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