cost·ly

[kawst-lee, kost-]
adjective, cost·li·er, cost·li·est.
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; Middle English costli. See cost, -ly

cost·li·ness, noun
o·ver·cost·li·ness, noun
o·ver·cost·ly, adjective
un·cost·ly, adjective


1. dear, high-priced. See expensive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Costly is always a great word to know.
So is slumgullion. Does it mean:
the offspring of a zebra and a donkey.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
costly (ˈkɒstlɪ) [Click for IPA pronunciation guide]
 
adj , -lier, -liest
1.  of great price or value; expensive
2.  entailing great loss or sacrifice: a costly victory
3.  splendid; lavish
 
'costliness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

costly
late 14c., from cost + -ly. Earlier formation with the same sense were costful (mid-13c.), costious (mid-14c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Energy and the technology to desalinate water are both expensive, and this
  means that desalinating water can be pretty costly.
City trips are often expensive because of costly hotel fees.
To feed the microbes, plants must aerate sewage sludge with costly,
  power-hogging equipment.
It is too large and would be too costly and complicated.
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