| disease(noun, disorder, weakness, fault, illness) |
| dose(noun, disorder, disease, collapse, disturbance) |
| failing(noun, disorder, weakness, fault, illness) |
| failing health(noun, expression, disorder, collapse, disturbance) |
| fault(noun, disorder, weakness, illness, failing) |
| feebleness(noun, disorder, weakness, fault, illness) |
| fit(noun, disorder, disease, collapse, disturbance) |
| flimsiness(noun, weakness, failing, delicacy, infirmity) |
| flu(noun, disorder, disease, weakness, collapse) |
| fragileness(noun, weakness, failing, delicacy, infirmity) |
| fragility(noun, weakness, failing, delicacy, infirmity) |
| frailness(noun, disorder, weakness, fault, illness) |
| frailty(noun, disorder, weakness, fault, illness) |
| ill health(noun, expression, disorder, disease, weakness) |
| illness(noun, disorder, disease, weakness, sickness) |
| imperfection(noun, disorder, weakness, fault, illness) |
| indisposition(noun, disorder, disease, weakness, collapse) |
| infirmity(noun, disorder, disease, weakness, collapse) |
| insubstantiality(noun, weakness, failing, infirmity, fragility) |
| malady(noun, disorder, disease, weakness, collapse) |