waste

Dictionary definition · waste

any materials unused and rejected as worthless or unwanted"they collect the waste once a week"
useless or profitless activity; using or expending or consuming thoughtlessly or carelessly"if the effort brings no compensating gain, it is a waste"
the trait of wasting resources"a life characterized by thriftlessness and waste"
an uninhabited wilderness that is worthless for cultivation"the barrens of central Africa"
(law) reduction in the value of an estate caused by act or neglect

spend thoughtlessly; throw away"He wasted his inheritance on his insincere friends"
use inefficiently or inappropriately"waste heat"
dispose of"We waste the dirty water by channeling it into the sewer"
run off as waste"The water wastes back into the ocean"
get rid of (someone who may be a threat) by killing"The mafia liquidated the informer"
spend extravagantly"waste not, want not"

Source: Open English WordNet (CC BY 4.0).