#mental_retardation__retardation__backwardness__slowness__subnormality  lack of normal development of intellectual capacities
  supertype:  #stupidity  a poor ability to understand or to profit from experience
  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

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