| impuissance(noun, weak, sick, unhealthy) |
| inability(noun, weakness, delicacy, inadequacy, shakiness) |
| inactivity |
| inclination(noun, weakness, fault, lack, lapse) |
| incompetence(noun, weakness, delicacy, inadequacy, shakiness) |
| inconstancy(noun, weakness, fault, lack, lapse) |
| indecision(noun, weakness, fault, lack, lapse) |
| indifference |
| ineffectualness(noun, weakness, delicacy, inadequacy, shakiness) |
| inertia(noun, weak, sick, unhealthy) |
| infirmness(noun, disorder, weakness, illness, sickness) |
| insignificance(noun, weakness, delicacy, inadequacy, shakiness) |
| instability(noun, weakness, fault, lack, lapse) |
| insufficiency(noun, weakness, delicacy, inadequacy, shakiness) |
| invalidity(noun, weakness, fault, lack, lapse) |
| irresolution(noun, weakness, fault, lack, lapse) |
| labefaction(noun, weak, sick, unhealthy) |
| lack(noun, weakness, fault, lapse, failing) |
| lack of energy(noun, weak, sick, unhealthy) |
| lameness(noun, weakness, delicacy, inadequacy, shakiness) |