| cast down(verb, expression, upset, trouble, dull) |
| cause ennui(expression, annoy, depress, exhaust, drain) |
| cause instability(verb, expression, reduce, ruin, weaken) |
| cheapen(harm, hinder, spoil, weaken, blunt) |
| chill(verb, upset, trouble, dull, reduce) |
| chilled |
| cloy(verb, annoy, depress, exhaust, drain) |
| collapse(verb, fail, strain, annoy, exhaust) |
| confound(verb, upset, reduce, ruin, weaken) |
| confute(verb, reduce, ruin, weaken, subdue) |
| conk out(expression, take, weaken, drain, weary) |
| consume(verb, rub, grind, fray, erode) |
| controvert(verb, reduce, ruin, weaken, subdue) |
| cow(verb, upset, trouble, dull, reduce) |
| crawl(verb, worry, fail, strain, annoy) |
| crumble(verb, decline, reduce, fail, halt) |
| cut(verb, decline, reduce, fail, halt) |
| darken(verb, upset, trouble, dull, reduce) |
| deactivate(verb, restrict, incapacitate, inactivate) |
| debilitated |