Antonyms of adj affordable

1 sense of affordable

Sense 1
low-cost, low-priced, affordable -- (that you have the financial means for; "low-cost housing")

INDIRECT (VIA cheap) -> expensive -- (high in price or charging high prices; "expensive clothes"; "an expensive shop")

Similarity of adj affordable

1 sense of affordable

Sense 1
low-cost, low-priced, affordable -- (that you have the financial means for; "low-cost housing")
       => cheap (vs. expensive), inexpensive -- (relatively low in price or charging low prices; "it would have been cheap at twice the price"; "inexpensive family restaurants")