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Adjective: thickheaded  'thik,he-did
  1. (informal) stupid, slow witted or dull
    "He told me to tell you that you're a thickheaded lout";
    - blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick, thick-skulled, wooden-headed, birdbrained, pea-brained, muttonheaded, thick-witted

See also: stupid