noun
excessive or extravagant spending or lavishness
adjective
prodigal (relating to or characterized by prodigality)
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The prodigality of the royal family's spending was a cause for concern among the citizens.
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His prodigality knew no bounds when it came to buying the latest gadgets.
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She's known for her prodigality when it comes to splurging on designer clothes.
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The artist's prodigality of colors in his painting created a mesmerizing effect.