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English definition of “costly”

costly

adjective     /ˈkɒstli/
EXPENSIVE expensive: [+ to do sth] It would be too costly to build a swimming pool.Costing too muchExpensive and luxurious
CAUSING PROBLEMS causing a lot of problems, or making you lose something important: a costly mistakeDamaging and spoilingDestroying and demolishing
(Definition of costly adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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