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WordReference Random House Learner's Dictionary of American English © 2024cost•ly /ˈkɔstli, ˈkɑst-/USA pronunciation adj., -li•er, -li•est. - costing much;
high in price:a costly mink coat. - resulting in great loss:a costly mistake.
cost•li•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024cost•ly (kôst′lē, kost′-),USA pronunciation adj., -li•er, -li•est. - costing 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.
- Middle English costli. See cost1, -ly 1350–1400
- 1.See corresponding entry in Unabridged dear, high-priced. See expensive.
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