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Noun: idiocy  i-dee-u-see
Usage: archaic
  1. Severe intellectual disability or mental deficiency present from birth
    "The condition was diagnosed as idiocy requiring lifelong care";
    - amentia

Derived forms: idiocies

Type of: backwardness [archaic], mental retardation [archaic], retardation [archaic], slowness, subnormality [archaic]

Encyclopedia: Idiocy