Costly - definition of costly by The Free Dictionary cost·ly (kôst′lē) adj cost·li·er, cost·li·est 1 Of high price or value; expensive: costly jewelry 2 Entailing loss or sacrifice: a costly war cost′li·ness n
costly - Wiktionary, the free dictionary In the early days troubles were experienced with oscillation from the rod drive and with the transformers, but were overcome later, and these machines performed useful service until superseded by more modern locomotives less costly in maintenance