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English definition of “costly”

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costly

adjective uk   /ˈkɒst.li/ us    /ˈkɑːst-/

costly adjective (EXPENSIVE)

expensive: a costly item a costly purchase disapproving The project was subject to several costly delays/setbacks.

costly adjective (DAMAGING)

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).
costliness
noun [U] uk   /-nəs/ us  
(Definition of costly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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