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Adjective: pea-brained
  1. (informal) stupid, slow witted or dull
    "Anyone know how Lawrence got to be such a pea-brained bigot?";
    - blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick, thickheaded, thick-skulled, wooden-headed, birdbrained, muttonheaded, thick-witted

See also: stupid