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Adjective: imbecilic  ,im-bi'si-lik
  1. Devoid of good sense or judgment
    - foolish, stupid, daft [Brit, informal], dumb, imbecile
     
  2. [archaic] Having a mental age of three to seven years
    "I imagine that there are as many imbecilic and feeble-minded women as there are imbecilic and feeble-minded men";
    - idiotic

See also: absurd, cockeyed [informal], derisory, fond, goofy [informal], harebrained, idiotic, ill-advised, ill-conceived, impolitic, imprudent, inadvisable, insane, laughable, ludicrous, mad, mentally retarded, mindless, misbegotten, misguided, nonsensical, preposterous, rattlebrained, rattlepated, retarded, ridic [informal], ridiculous, scatterbrained, scatty [Brit, informal], silly, unadvisable, unadvised, unwise, vacuous, wacky, whacky, zany