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costly Syllabification: cost·ly
Pronunciation: /ˈkôs(t)lē/

Definition of costly in English:

adjective (costlier, costliest)

1Costing a lot; expensive: major problems requiring costly repairs
More example sentences
  • This scared her because she feared not following through might one day be costly in terms of her job.
  • As in real life, a managerial appointment made in haste could end up being financially costly in the long run.
  • Legal processes are costly in terms of both the fees and the management time involved.
expensive, dear, high-priced, highly priced, overpriced
informalsteep, pricey, spendy, costing an arm and a leg, costing the earth
1.1Causing suffering, loss, or disadvantage: the government’s biggest and most costly mistake
More example sentences
  • This will teach him very early in life that some mistakes are costly and cannot afford to be made again.
  • With hindsight it might have been a costly mistake but we put the education of our students first and foremost.
  • It seems the council missed out on an opportunity and made a costly mistake.
damaging, harmful, injurious, deleterious, woeful, awful, terrible, dreadful



Pronunciation: /ˈkäs(t)lēnəs/
Example sentences
  • Scarcity and resulting costliness confined its use chiefly to precious metalworking, where it was employed as a flux to cleanse surfaces of oxides and reduce melting temperatures to aid welding and soldering.
  • The relative costliness of labor encouraged labor-saving mechanization; the scarcity of capital made it worthwhile to build machines cheaply and use them intensively.
  • The goals of this program are to limit the frequency, severity and costliness of asthma exacerbations through extensive education of physicians, children and caregivers.

Definition of costly in:

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