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

See also: stupid