| impairment(noun, decline, weakness, collapse, fault) |
| impotence(noun, weakness, fault, lack, lapse) |
| inability(noun, weakness, delicacy, inadequacy, shakiness) |
| inclination(noun, weakness, fault, lack, lapse) |
| incompetence(noun, weakness, delicacy, inadequacy, shakiness) |
| inconstancy(noun, weakness, fault, lack, lapse) |
| indecision(noun, weakness, fault, lack, lapse) |
| ineffectualness(noun, weakness, delicacy, inadequacy, shakiness) |
| infirmness(noun, disorder, weakness, illness, sickness) |
| infliction(noun, disease) |
| insignificance(noun, weakness, delicacy, inadequacy, shakiness) |
| insufficiency(noun, weakness, delicacy, inadequacy, shakiness) |
| invalidation |
| invalidity(noun, weakness, fault, lack, lapse) |
| irresolution(noun, weakness, fault, lack, lapse) |
| lack(noun, weakness, fault, lapse, failing) |
| lameness(noun, weakness, delicacy, inadequacy, shakiness) |
| languishing |
| languor(noun, weakness, fault, lack, lapse) |
| lapse(noun, drop, fall, weakness, fault) |