From Longman Dictionary of Contemporary Englishlumpishlump‧ish /ˈlʌmpɪʃ/ adjective STUPID/NOT INTELLIGENTheavy and awkward
Examples from the Corpus
lumpish• lumpish dialogue• lumpish food• Those large and lumpish hands could produce exquisitely fine work when required, and she relished the thoughts of others. 