| disintegrate(verb, dull, decline, spoil, weaken) |
| dissolve(verb, decline, weaken, lessen, degenerate) |
| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dwindle(verb, decline, weaken, lessen, degenerate) |
| fade(verb, decline, weaken, lessen, degenerate) |
| fail(verb, decline, weaken, lessen, degenerate) |
| get worse(expression, decline, weaken, lessen, degenerate) |
| go to seed(expression, idiom, decline, weaken, lessen) |
| go to the dogs(expression, idiom, decline, weaken, lessen) |
| hit rock bottom(expression, idiom, decline, weaken, lessen) |
| hit the skids(expression, idiom, decline, weaken, lessen) |
| lessen(verb, decline, weaken, degenerate, deteriorate) |
| mildew(verb, decline, weaken, lessen, degenerate) |
| mold(verb, decline, weaken, lessen, degenerate) |
| molder(verb, dull, decline, spoil, weaken) |
| mortify(verb, decline, weaken, lessen, degenerate) |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, degenerate) |
| pollute(verb, decline, weaken, lessen, degenerate) |
| putresce(verb, decline, weaken, lessen, degenerate) |