In a way that spends money freely and extravagantly without concern for cost.
From Latin 'dispendiosus' meaning costly or expensive, derived from 'dispendere' (to weigh out, spend). The suffix '-ly' converts the adjective to an adverb indicating manner.
This word is nearly extinct in modern English, but it reveals how Romans had specialized vocabulary for different types of spending—they weren't just 'expensive' but specifically 'weighing out' money, a metaphor from commerce and trade.
Complete word intelligence in one call. Free tier — 50 lookups/day.