adjective, cost·li·er, cost·li·est.
Origin of costly
Related formscost·li·ness, nouno·ver·cost·li·ness, nouno·ver·cost·ly, adjectiveun·cost·ly, adjective
Examples from the Web for costly
Pulling oil from the tar sands is costly, even more so when you tack transportation costs on top.
The studio took him at his word and jumped at the chance to close down, or at least reduce, his costly operation.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
Is she too hawkish for the activists who helped make her vote for the Iraq War so costly back in the 2008 campaign?
Governor Bobby Jindal insists it would be too costly for the state, whose share would total nearly $2 billion over 10 years.
No matter how constitutionally suspect, how costly, how slapdash, or how disappointing a grand policy might be, well, they tried.
Of fur of costly otter / his mantle was complete, With other skins embroidered / from head unto the feet.The Nibelungenlied|Unknown
The lady acknowledged the costly offering by a gracious smile, and a low bend of the head toward the giver.Philothea|Lydia Maria Child
He likewise sailed in a costly ship; its anchor was inlaid with pure gold, and every rope was of twisted silk.The Sand-Hills of Jutland|Hans Christian Andersen
He asked Forester which was the most costly of all the woods.Forests of Maine|Jacob S. Abbott
The fingers were covered with the most costly rings, no doubt since added.Servia, Youngest Member of the European Family|Andrew Archibald Paton