'sumptuous' originates from Latin, specifically the word 'sumptuosus,' where 'sumptus' meant 'expense.'

'sumptuosus' transformed into the Old French word 'sumptueux,' and eventually became the modern English word 'sumptuous' through Middle English.

Initially, it meant 'expensive or costly,' but over time it evolved into its current meaning of 'splendid and expensive-looking.'