EnglishEdit

EtymologyEdit

From Middle English costly, costely, costeley, equivalent to cost +‎ -ly.

PronunciationEdit

AdjectiveEdit

costly (comparative costlier, superlative costliest)

  1. Of high cost; expensive.
    a costly activity
    a costly error
    • 2011 October 15, Michael Da Silva, “Wigan 1 - 3 Bolton”, in BBC Sport[1]:
      Individual mistakes proved costly for Wigan who, particularly after the half-time introduction of Hugo Rodallega, dominated for long periods.

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