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Adjective: idiotic  ,i-dee'ó-tik
  1. Insanely irresponsible
    "an idiotic idea";
    - crackbrained
  2. So unreasonable as to invite derision
    "the idiotic excuse that the dog ate his homework";
    - absurd, cockeyed [informal], derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous, ridic [informal]
  3. Having a mental age of three to seven years
    "I imagine that there are as many idiotic and feeble-minded women as there are imbecilic and feeble-minded men";
    - imbecilic [archaic]

See also: daft [Brit, informal], dumb, foolish, imbecile, imbecilic, insane, mentally retarded, retarded, stupid

Encyclopedia: Idiotic