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Adjective: thick-skulled  'thik 'skúld
Usage: informal
  1. Stupid, slow witted or dull
    "Anyone know how Lawrence got to be such a thick-skulled bigot?";
    - blockheaded [informal], boneheaded [informal], duncical [informal], duncish [informal], fatheaded [informal], loggerheaded [informal], thick [informal], thickheaded [informal], wooden-headed [informal], chuckleheaded [informal], pea-brained [informal], birdbrained [informal], muttonheaded [informal], knuckleheaded [informal], dunderheaded [informal], thick-witted [informal]

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