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costly

[kawst-lee, kost-] /ˈkɔst li, ˈkɒst-/
adjective, costlier, costliest.
1.
costing much; expensive; high in price:
a costly emerald bracelet; costly medical care.
2.
resulting in great expense:
The upkeep of such a large house is costly.
3.
resulting in great detriment:
It was a costly mistake because no one ever trusted him again.
4.
of great value; very valuable; sumptuous.
5.
lavish; extravagant.
Origin
1350-1400
1350-1400; Middle English costli. See cost, -ly
Related forms
costliness, noun
overcostliness, noun
overcostly, adjective
uncostly, adjective
Synonyms
1. dear, high-priced. See expensive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for uncostly

costly

/ˈkɒstlɪ/
adjective -lier, -liest
1.
of great price or value; expensive
2.
entailing great loss or sacrifice: a costly victory
3.
splendid; lavish
Derived Forms
costliness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for uncostly

costly

adj.

late 14c., from cost + -ly (1). Earlier formation with the same sense were costful (mid-13c.), costious (mid-14c.).

Online Etymology Dictionary, © 2010 Douglas Harper
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