| frailty(noun, weakness, skill, failure, delicacy) |
| fruitlessness |
| imperfection(defect, inadequacy, shortage, inability, dearth) |
| inanity |
| inaptitude(noun, weakness, skill, failure, shortcoming) |
| incapacitation(noun, weakness, skill, failure, shortcoming) |
| incompleteness(defect, deficiency, imperfection, inadequacy, shortage) |
| inefficaciousness |
| infertility |
| infirmity(noun, weakness, delicacy, inadequacy, hopelessness) |
| infirmness(noun, weakness, delicacy, inadequacy, shakiness) |
| insignificance(noun, weakness, delicacy, inadequacy, shakiness) |
| insufficiency(noun, weakness, skill, failure, lack) |
| inutility(noun, weakness, skill, failure, shortcoming) |
| invalidity |
| lack(noun, weakness, skill, failure, failing) |
| lameness(noun, weakness, delicacy, inadequacy, shakiness) |
| languor(noun, weakness, delicacy, inadequacy, shakiness) |
| lassitude(noun, weakness, delicacy, inadequacy, shakiness) |
| malaise(noun, weakness, delicacy, inadequacy, shakiness) |