SUMPTUOUS Meaning of SUMPTUOUS in English ■ adjective splendid and expensive-looking.Derivativessumptuosity noun~ly adverb~ness noun OriginME: from OFr. somptueux , from L. sumptuosus , from sumptus (see sumptuary ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004