Antonyms of adj costly

2 senses of costly

Sense 1
dearly-won, costly -- (entailing great loss or sacrifice; "a dearly-won victory")

INDIRECT (VIA expensive) -> cheap, inexpensive -- (relatively low in price or charging low prices; "it would have been cheap at twice the price"; "inexpensive family restaurants")

Sense 2
costly, dear (predicate), high-priced, pricey, pricy -- (having a high price; "costly jewelry"; "high-priced merchandise"; "much too dear for my pocketbook"; "a pricey restaurant")

INDIRECT (VIA expensive) -> cheap, inexpensive -- (relatively low in price or charging low prices; "it would have been cheap at twice the price"; "inexpensive family restaurants")

Similarity of adj costly

2 senses of costly

Sense 1
dearly-won, costly -- (entailing great loss or sacrifice; "a dearly-won victory")
       => expensive (vs. cheap) -- (high in price or charging high prices; "expensive clothes"; "an expensive shop")

Sense 2
costly, dear (predicate), high-priced, pricey, pricy -- (having a high price; "costly jewelry"; "high-priced merchandise"; "much too dear for my pocketbook"; "a pricey restaurant")
       => expensive (vs. cheap) -- (high in price or charging high prices; "expensive clothes"; "an expensive shop")