Frugal

From Middle French, from Latin frugalis "virtuous, thrifty"

Full definition of frugal

Avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste.

1776, Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations, By what a frugal man annually saves, he not only affords maintenance to an additional number of productive hands, for that or the ensuing year, but also establishes as it were a perpetual fund for the maintenance of an equal number in all times to come.