[1] : WordNet (r) 2.0

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

[2] : 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

Stumblebum >> S Words
Stumblebum, definition of term: Stumblebum
stumblebum_pag1.html