| debilitated(adjective, weak, thin, delicate, ill) |
| decadence(noun, decline, ruin, collapse, deterioration) |
| decrepit(adjective, weak, thin, delicate, ill) |
| defeat(noun, decline, ruin, neglect, collapse) |
| defection(noun, failure, rejection, withdrawal, abandonment) |
| demerit(noun, weakness, lack, flaw, defect) |
| disease(noun, disorder, defeat, weakness, fault) |
| dwindling(noun, adjective, drop, decline, fall) |
| exhausted(adjective, weak, thin, delicate, shaky) |
| falling(verb, unsuccessful, lessening, worsening, deteriorating) |
| flagging(adjective, weakening, lessening, fading, deteriorating) |
| flopping |
| imperfect(weak, poor, short, inadequate, insufficient) |
| incomplete(poor, short, inadequate, insufficient, deficient) |
| ineffectual(adjective, weak, thin, delicate, shaky) |
| insufficient(adjective, close, light, weak, poor) |
| languishing(verb, adjective, weakening, fading, wearying) |
| miscarrying |
| negligence(noun, wrong, slip, weakness, burden) |
| relapse(noun, drop, fall, failure, deterioration) |