noun
a person who spends money in a recklessly extravagant way
adjective
recklessly extravagant or wasteful in the use of resources
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The profligate spending habits of the government have led to a significant increase in national debt.
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She's so profligate with her money, always buying the latest gadgets and designer clothes.
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I can't believe how profligate he is with his allowance, always blowing it on useless stuff.
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His profligate use of resources is like pouring water into a leaky bucket, never achieving any real progress.