Definition of lumpen adjective from the Oxford Advanced Learner's Dictionary

 

lumpen

 adjective
adjective
BrE BrE//ˈlʌmpən//
 
; NAmE NAmE//ˈlʌmpən//
 
(British English, literary)
 
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looking heavy and awkward or stupid Word Origin 1940s: back-formation from lumpenproletariat; the sense ‘misshapen, ponderous’ is by association with lumpish.