Adjectives

(s)economic, economicalusing the minimum of time or resources necessary for effectiveness“an economic use of home heating oil”, “a modern economical heating system”, “an economical use of her time”
(a)economic, economicalof or relating to an economy, the system of production and management of material wealth“economic growth”, “aspects of social, political, and economical life”
(s)economical, frugal, scotch, sparing, stintingavoiding waste“an economical meal”, “an economical shopper”, “a frugal farmer”, “a frugal lunch”, “a sparing father and a spending son”, “sparing in their use of heat and light”, “stinting in bestowing gifts”, “‘scotch’ is used only informally”