Etymology
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lummox (n.)

"clumsy, stupid man," 1825, East Anglian slang, of unknown origin. Perhaps from dumb ox, influenced by lumbering; or from or related to dialectal verb lummock "move heavily or clumsily," itself a word of uncertain origin.

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Definitions of lummox

lummox (n.)
an awkward stupid person;
Synonyms: lout / clod / stumblebum / goon / oaf / lubber / lump / gawk
From wordnet.princeton.edu