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costly

B2
adjective

Pronunciation

UK

  • /kˈɒstli/

US

  • /ˈkɑstli/
  • /ˈkɔstli/

Description

Something that is costly requires a significant amount of money or effort. It is more than just expensive; it often implies a real sacrifice or a deep investment. A new car can be costly, but so can the time and energy needed to care for a sick family member. You might also describe a mistake as "costly" if it leads to serious or painful consequences.

Think of it like this: cheap things have a low cost, while truly costly items demand more from you—whether it's your wallet, your time, or your peace of mind. A costly lesson is one learned the hard way. The word often carries a sense of weight or even regret; it is not just about price tags, but about what things take from us.

Examples

  1. 1

    Medical treatment

    Medical treatment can be costly if you don’t have insurance.

  2. 2

    Equipment replacement

    It would be too costly to replace all the computers this year.

  3. 3

    Legal dispute

    The legal battle was long and costly, so both sides agreed to settle.

  4. 4

    Business mistake

    Missing that deadline was a costly mistake for the company.

    • Phrase

      costly mistake

      a mistake that causes serious loss or problems

  5. 5

    Sports disadvantage

    The early red card proved costly for the team.

    • Pattern

      prove costly for + person/group

      cause them to suffer a loss or disadvantage

Forms and spellings

3 forms open this card.

Main spelling

  • costlyadjective

Forms

  • costliestsuperlativeadjective
  • costliercomparativeadjective