the word's journey begins with the latin verb 'sumere', meaning 'to take' or 'to use up', which evolved into 'sumptus', signifying 'expense' or 'cost'. this root entered english via old french 'somptueux', carrying the sense of lavish expenditure. the suffix '-ous' attaches to form the adjective 'sumptuous', meaning 'full of expense' or 'lavish'. finally, the old english adverbial suffix '-ly' is added, transforming it into an adverb that describes an action performed in a manner characterized by great luxury and opulence, thus connecting the ancient concept of consumption and cost to modern descriptions of extravagant display.

Structure: sumptu (expense, cost) + ous (adjective suffix) + ly (adverb suffix) sumptu is from latin 'sumptus' (expense, cost), derived from the verb 'sumere' (to take, to spend). ous is an english suffix forming adjectives, from latin '-osus' (full of). ly is an english suffix forming adverbs from adjectives, from old english '-lice'.