Adjective spendthrift has 1 sense
  1. extravagant, prodigal, profligate, spendthrift - recklessly wasteful; "prodigal in their expenditures"
    Antonym: thrifty (indirect, via wasteful)
,Noun spendthrift has 1 sense
  1. spendthrift, spend-all, spender, scattergood - someone who spends money prodigally
    --1 is a kind of prodigal, profligate, squanderer
    --1 has particulars: big spender, high roller; fungi
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