| languish(decline, weaken, degenerate, deteriorate, decay) |
| mildew(verb, decline, weaken, lessen, degenerate) |
| mold(verb, decline, weaken, lessen, degenerate) |
| mortify(verb, decline, weaken, lessen, degenerate) |
| nibble |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, blow, weaken, lessen) |
| pollute(verb, break, dull, decline, hurt) |
| putresce(verb, decline, weaken, lessen, degenerate) |
| reach depths(expression, decline, weaken, lessen, degenerate) |
| sap(verb, decline, hurt, ruin, destroy) |
| shrink(verb, decline, diminish, use, weary) |
| shrivel(verb, decline, weaken, lessen, degenerate) |
| sicken(verb, decline, pain, weaken, lessen) |
| slump(verb, decline, weaken, lessen, degenerate) |
| split(harm, spoil, injure) |
| suppurate(verb, decline, weaken, lessen, degenerate) |
| turn(verb, decline, weaken, lessen, degenerate) |
| vitiate(verb, break, dull, decline, hurt) |
| weaken(verb, break, decline, hurt, ruin) |