Wasteful a. : Full of waste; destructive to property; ruinous; as, wasteful practices or negligence; wasteful expenses.

Wasteful a. : Expending, or tending to expend, property, or that which is valuable, in a needless or useless manner; lavish; prodigal; as, a wasteful person; a wasteful disposition.

Wasteful a. : Waste; desolate; unoccupied; untilled.

Example:
What are some major differences between the US and less Wasteful countries?

Taxonomy
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Defination from the web:
wasteful in the Online Dictionary. Meaning of wasteful. Pronunciation of wasteful. Translations of wasteful. wasteful synonyms, wasteful antonyms. ... to be wasteful with sth despilfarrar algo, desperdiciar algo ...