| Term | Definition |
| accumlulate | to increase in number |
| aggravate | to make worse |
| conserve | to save by using carefully |
| vital | full of lively spirit |
| contaminate | to harm by contact with something undesirable |
| diminish | to reduce |
| drastic | severe;extreme |
| extravagant | spending more than necessary |
| frugal | careful in spending or using something |
| impurity | something that is harmful or dirty |
| peril | danger |
| perpetual | lasting forever |
| resource | a supply that can be used when needed |
| substitute | to replace one thing or person for another |
| sustain | to keep up |