Accumulate
To increase in number or amount
Aggravate
To make worse or to anger or annoy
Conserve
To save by using carefully
Contaminate
To harm by contact with something undesirable
Diminish
To make or become smaller or less
Drastic
Severe or extreme
Extravagant
Spending or using more than is required
Frugal
Careful in spending or using
Impurity
Something that is harmful or dirty
Peril
Danger or something that is dangerous
Perpetual
Lasting or seeming to last forever
Resource
A supply that can be used when there is need
Substitute
To replace
Sustain
To keep up or support
Vital
Necessary for continued life or prosperity