noun
a person who spends money in a wasteful or extravagant way
adjective
wastefully or recklessly extravagant
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The prodigal son returned home after squandering his inheritance.
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I heard Mark is the prodigal of the family, always spending money recklessly.
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Don't be a prodigal with your cash, save some for a rainy day.
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The artist's prodigal use of colors brought the painting to life.