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Word

costly

adjective C1
/ˈkɒst.li/

Meanings

adjective

Expensive; costing a lot of money.

costly: Expensive; costing a lot of money.
adjective

Causing serious loss, damage, or difficulty; having a high price in consequences.

costly: Causing serious loss, damage, or difficulty; having a high price in consequences.

Definition

Costly means expensive or requiring a lot of money, time, or effort.

If something is costly, it is expensive and requires a large amount of money. It can also describe mistakes or decisions that cause serious losses or problems, even if they are not directly about price. In both cases, the idea is that the “cost” is high compared with what is normal or expected.

Examples

  • I avoided the premium package because it looked costly for what it actually offered.
  • You may find the repairs costly if you keep postponing basic maintenance.
  • He realized too late that a costly mistake can undo months of careful planning.
  • She chose a simpler venue after the first quotes made the event seem costly.
  • They learned that ignoring small issues can become costly when deadlines tighten.

Common mistake

Learners sometimes use "costly" only for price, but it can also describe mistakes or decisions with severe consequences.