| feeble(noun, weak, sick, unhealthy) |
| feebleness(noun, weak, sick, unhealthy) |
| flabbiness(noun, weak, sick, unhealthy) |
| flaccidity(noun, weak, sick, unhealthy) |
| foible(noun, weak, sick, unhealthy) |
| fragility(noun, weak, sick, unhealthy) |
| frailty(noun, weak, sick, unhealthy) |
| frangibility(noun, weak, sick, unhealthy) |
| hyposthenia(noun, weak, sick, unhealthy) |
| impuissance(noun, weak, sick, unhealthy) |
| inertia(noun, weak, sick, unhealthy) |
| infirmity(noun, weak, sick, unhealthy) |
| labefaction(noun, weak, sick, unhealthy) |
| lack of energy(noun, weak, sick, unhealthy) |
| languish(noun, weak, sick, unhealthy) |
| lassitude |
| laxity(noun, weak, sick, unhealthy) |
| laxness(noun, weak, sick, unhealthy) |
| limpness(noun, weak, sick, unhealthy) |
| listlessness |