- extravagant, prodigal, profligate, spendthrift - recklessly wasteful; "prodigal in their expenditures"
Antonym: thrifty (indirect, via wasteful)
- spendthrift, spend-all, spender, scattergood - someone who spends money prodigally
--1 is a kind of prodigal, profligate, squanderer
--1 has particulars: big spender, high roller; fungi