1. comparative form of costly; more expensive or requiring greater expenditure
Usage: comparative form
2. comparative form of costly; involving greater loss, sacrifice, or negative consequences
Usage: comparative form; figurative use

Examples

• The organic vegetables are costlier than the regular ones.
• Living in the city center is costlier than the suburbs.
• The premium insurance plan is costlier but offers better coverage.
• His mistake proved costlier than anyone had anticipated.
• The delay made the project even costlier for the company.
• Designer clothes are generally costlier than mass-produced items.