stumblebum

from WordNet (r) 3.0 (2006)

stumblebum
    n 1: a second-rate prize fighter [syn: {stumblebum}, {palooka}]
    2: an awkward stupid person [syn: {lout}, {clod}, {stumblebum},
       {goon}, {oaf}, {lubber}, {lummox}, {lump}, {gawk}]

from Moby Thesaurus II by Grady Ward, 1.0

22 Moby Thesaurus words for "stumblebum":
      blunderbuss, blunderer, bungler, butterfingers, clumsy, dub,
      duffer, foozler, foul-up, fumble-fist, goof, goofball, goofer,
      hick, incompetent, lummox, lump, muff, muffer, rube, slob,
      stumblebunny

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