Longman Dictionary of Contemporary English homepage

costly

 adjective
     
cost‧ly
1 very expensive, especially wasting a lot of money:
a complex and costly procedure
Such a database would be extremely costly to set up.
2 something that is costly causes a lot of problems or trouble:
His delay in making a decision could prove costly in the long run.
—costliness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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