| lessen(verb, decline, weaken, degenerate, deteriorate) |
| mildew(verb, decline, weaken, lessen, degenerate) |
| mold(verb, decline, weaken, lessen, foul) |
| molder(verb, decline, weaken, lessen, degenerate) |
| mortify(verb, decline, weaken, lessen, degenerate) |
| motley |
| muddy(verb, dull, hurt, harm, spoil) |
| nick |
| notch |
| pale(verb, dull, dirty, corrupt, stain) |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, degenerate) |
| poison(hurt, dirty, corrupt, stain, deterioration) |
| putrefy(verb, decline, hurt, harm, spoil) |
| putresce(verb, decline, weaken, lessen, degenerate) |
| reach depths(expression, decline, weaken, lessen, degenerate) |
| riddle |
| rot(verb, break, decline, hurt, ruin) |
| sap(verb, decline, weaken, lessen, degenerate) |
| scorch(verb, harm, spoil, injure, color) |