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costly

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adjective formal American English pronunciation: costly /ˈkɔs(t)li/ 
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adjectivecostly
comparativecostlier
superlativecostliest
  1. 1
    costing a lot of money

    They have been investing in costly new equipment.

    a costly business/process/exercise:

    Changing your company's management style can be a costly business.

  2. 2
    causing a lot of problems

    Dropping the ball with only seconds left to play was a costly mistake.

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