LUMPY Meaning of LUMPY in English adj. 25B6; adjectivea lumpy mattress : BUMPY, knobbly, bulging, uneven, rough, gnarled. lumpy custard : CLOTTED, curdled, congealed, coagulated. Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012