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[kawst-lee, kost-] /ˈkɔst li, ˈkɒst-/

adjective, costlier, costliest.
much; expensive; high in price:
a costly emerald bracelet; costly medical care.
resulting in great expense:
The upkeep of such a large house is costly.
resulting in great detriment:
It was a costly mistake because no one ever trusted him again.
of great value; very valuable; sumptuous.
lavish; extravagant.
adjective -lier, -liest
of great price or value; expensive
entailing great loss or sacrifice: a costly victory
splendid; lavish

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


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