"spendthrift" in the noun sense
1. spendthrift, spend-all, spender, scattergood
someone who spends money prodigally
"spendthrift" in the adjective sense
1. extravagant, prodigal, profligate, spendthrift
recklessly wasteful
"prodigal in their expenditures"
Source: WordNet® (An amazing lexical database of English)
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