Source : Webster's Revised Unabridged Dictionary (1913)

Lummox \Lum"mox\, n.
   A fat, ungainly, stupid person; an awkward bungler. [Law.]

Source : WordNet®

lummox
     n : an awkward stupid person [syn: {lout}, {clod}, {stumblebum},
          {goon}, {oaf}, {lubber}, {lump}, {gawk}]