muddlehead

from The Collaborative International Dictionary of English v.0.48

Muddlehead \Mud"dle*head`\, n.
   A stupid person; a blunderer. [Colloq.] --C. Reade. --
   {Mud"dle-head`ed}, a. [Colloq.] --Dickens.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

46 Moby Thesaurus words for "muddlehead":
      addlebrain, addlehead, addlepate, beefhead, blockhead, blubberhead,
      blunderhead, bonehead, bufflehead, cabbagehead, chowderhead,
      chucklehead, clodhead, clodpate, clodpoll, dimwit, dolt, dolthead,
      dullhead, dumbbell, dumbhead, dunderhead, dunderpate, fathead,
      idiot, jolterhead, jughead, knucklehead, lunkhead, meathead, moron,
      mushhead, muttonhead, noodlehead, numskull, peabrain, pinbrain,
      pinhead, puddinghead, pumpkin head, puzzlehead, simpleton,
      stupidhead, thickhead, thickskull, tottyhead