Definition

wasteful (spending): extravagant, needless, uneconomical (spending) adjective
(a) wasteful (person): (someone who) spends too much money or is frivolous adjective
to waste: to squander, to use up, to misuse, to not save, to needlessly use, to use badly verb

UK: I'm a busy woman, please don't waste my time!
US: Our spending this month has been very wasteful.
  • "This is exactly the type of wasteful spending I'm talking about."
  • "Not only are private plane flights expensive and wasteful, but Horatio is terrified of machines, with the exception of his juicer."

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