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English definition of “costly”

costly

adjective (DAMAGING)    /ˈkɒst.li/ US  /ˈkɑːst-/
involving a lot of loss or damage: Building this bridge has already been too costly in terms of lives (= people have been killed while working on it).Destroying and demolishingDamaging and spoiling
(Definition of costly adjective (DAMAGING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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