dunderhead

from WordNet (r) 3.0 (2006)
dunderhead
    n 1: a stupid person; these words are used to express a low
         opinion of someone's intelligence [syn: {dunce},
         {dunderhead}, {numskull}, {blockhead}, {bonehead},
         {lunkhead}, {hammerhead}, {knucklehead}, {loggerhead},
         {muttonhead}, {shithead}, {dumbass}, {fuckhead}]
from The Collaborative International Dictionary of English v.0.48
Dunderhead \Dun"der*head`\, n. [Prov. Eng. also dunderpoll, from
   dunder, same as thunder.]
   A dunce; a numskull; a blockhead. --Beau. & Fl.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
44 Moby Thesaurus words for "dunderhead":
      addlebrain, addlehead, addlepate, beefhead, blockhead, blubberhead,
      blunderhead, bonehead, bufflehead, cabbagehead, chowderhead,
      chucklehead, clodhead, clodpate, clodpoll, dolthead, dope,
      dullhead, dumbhead, dunderpate, fathead, jolterhead, jughead,
      knucklehead, lunkhead, meathead, muddlehead, mushhead, muttonhead,
      noddy, noodle, noodlehead, numskull, peabrain, pinbrain, pinhead,
      puddinghead, pumpkin head, puzzlehead, stupe, stupidhead,
      thickhead, thickskull, tottyhead
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