Adjective costly has 2 senses
  1. dearly-won, costly - entailing great loss or sacrifice; "a dearly-won victory"
    Antonyms: cheap, inexpensive (indirect, via expensive)
  2. costly, dear, high-priced, pricey, pricy - having a high price; "costly jewelry"; "high-priced merchandise"; "much too dear for my pocketbook"; "a pricey restaurant"
    Antonyms: cheap, inexpensive (indirect, via expensive)
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