waste
Definitions
To use or expend something carelessly, extravagantly, or to no purpose.
Material that is not wanted or the unusable remains or byproducts of something.
To become progressively weaker, smaller, or more emaciated.
Examples
It is a waste of time to argue about things you cannot change.
Please do not waste water while you are brushing your teeth.
The factory was fined for dumping industrial waste into the river.