SUMPTUOUS Meaning of SUMPTUOUS in English adj. rich, lavish, costly (a sumptuous setting). sumptuosity n. sumptuously adv. sumptuousness n.[ ME f. OF somptueux f. L sumptuosus (as SUMPTUARY) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012