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costly (adj.)

"of great price, occasioning great expense," late 14c., from cost (n.) + -ly (1). Earlier formation with the same sense were costful (mid-13c.), costious (mid-14c.). Related: Costliness.

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Definitions of costly

costly (adj.)
having a high price;
costly jewelry
Synonyms: dear / high-priced / pricey / pricy
costly (adj.)
entailing great loss or sacrifice;
Synonyms: dearly-won
From wordnet.princeton.edu