"The barrens of central Africa", "The trackless wastes of the desert"
3.Definition: any materials unused and rejected as worthless or unwanted
"They collect the waste once a week", "Much of the waste material is carried off in the sewers"Category: General
"A life characterized by thriftlessness and waste", "The wastefulness of missed opportunities"
5.Definition: useless or profitless activity; using or expending or consuming thoughtlessly or carelessly
"If the effort brings no compensating gain it is a waste", "Mindless dissipation of natural resources"