uneconomical

Synonyms:
1. saving, provident, sparing, parsimonious. Economical, thrifty, frugal imply careful and saving use of resources. Economical implies prudent planning in the disposition of resources so as to avoid unnecessary waste or expense: economical in budgeting household expenditures. Thrifty is a stronger word than economical, and adds to it the idea of industry and successful management: a thrifty shopper looking for bargains. Frugal emphasizes being saving, sometimes excessively saving, esp. in such matters as food or dress: frugal almost to the point of being stingy.

Antonyms:
1. wasteful, extravagant, spendthrift, prodigal, profligate.