Main entry: wasteful
Definition: tending to squander and waste
Antonyms: thrifty
Definition: careful and diligent in the use of resources
Main entry: uneconomical, wasteful
Definition: inefficient in use of time and effort and materials
Usage: a clumsy and wasteful process; wasteful duplication of effort; uneconomical ebb and flow of power
Antonyms: efficient
Definition: being effective without wasting time or effort or expense
Main entry: wasteful
Definition: laying waste
Usage: when wasteful war shall statues overturn- Shakespeare
Antonyms: constructive
Definition: constructing or tending to construct or improve or promote development