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Adjective: feebleminded  ,fee-bul'mIn-did
  1. Slow to understand, learn or think; stupid
    "if we don't interfere, they will leave behind them so many feebleminded children";
    - backward, half-witted, slow-witted, dull-witted [archaic]

See also: mentally retarded, retarded

Encyclopedia: Feebleminded