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The surgery was costly, but it saved his life.
The surgery was expensive, but it saved his life.
expensive; having a high price or cost
The repairs to the car were costly.
The repairs to the car were expensive.
She bought a costly diamond ring for her wedding.
She bought an expensive diamond ring for her wedding.
Often used to emphasize the financial burden of something.
Use 'costly' to emphasize the financial burden or seriousness of an expense.
From Middle English 'costli', from Old English 'costlīc', from 'cost' + '-līc' (suffix meaning 'like').
Can be used to describe both tangible and intangible costs, such as time or effort.