noun
a person who spends money in an extravagant, irresponsible way
adjective
extravagant or wasteful in spending
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The spendthrift young man quickly depleted his inheritance on luxury items.
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She's such a spendthrift, always buying things she doesn't need.
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My friend is a total spendthrift, always blowing his money on useless stuff.
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Being a spendthrift with your time can be just as detrimental as being one with your money.