Antonym: cheap. Similar words: mostly, honestly, cost, costume, at any cost, at all costs, at the cost of, the cost of living. Meaning: ['kɒstlɪ] 
adj. 1. entailing great loss or sacrifice 2. having a high price.
adj. 1. entailing great loss or sacrifice 2. having a high price. 
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31. His delay in making a decision could prove costly in the long run.
32. At the required level of visual verisimilitude, computer animation is costly.
33. Take out our service contract and say goodbye to costly repair bills.
34. His plan is too costly to ever get off the ground.
35. These teaching methods are too costly in terms of staff resources.
36. It must be very costly to keep up a house like this.
37. Terrorist groups and the government have been engaged in a costly war of attrition since 1968.
38. Too controversial,(sentence dictionary) some warned. Too costly.
39. Making a shell is costly for a snail.
40. Not all good day care is so costly.
41. Not very costly, but there is some cost involved.
42. It is too inflexible, too costly, and too rigid.
43. Fossil hunting is a costly business.
44. Buying all those computers was a costly mistake.
45. Per unit of bitterness they are roughly as costly.
46. The war proved costly for both companies.
47. The day had been extraordinarily costly for both sides.
48. To do so is very costly.
49. Relocating individual staff abroad is an extremely costly procedure.
50. New, more costly technologies constantly escalate per capita costs.
51. Failure to protect yourself adequately could prove costly.
52. Relocating an employee can prove very costly.
53. Desirable desires are priceless, undesirable desires are costly. Dr T.P.Chia 
54. A costly and illogical drain on its scant resources.
55. A breakdown would be extremely costly and dangerous.
56. These braces are costly but well worth the outlay if the alternative is to stop skiing altogether.
57. The information system used to collate these statistics is presumably extensive and costly.
58. Yet in all but a very few, it is people that are the organisation's most costly and most valuable asset.
59. City Lands director Peter Coffey said alternative access routes were impractical or too costly.
60. The plans will show a more powerful and less costly product than existing prototypes.
More similar words: mostly, honestly, cost, costume, at any cost, at all costs, at the cost of, the cost of living, ecosystem, host, most, ghost, boost, at most, almost, poster, foster, hostile, post-war, hostage, partly, gently, softly, tightly, lightly, quietly, shortly, greatly, directly, slightly.