| inclination(noun, weakness, fault, lack, lapse) |
| inconstancy(noun, weakness, fault, lack, lapse) |
| indecision(noun, weakness, fault, lack, lapse) |
| indisposition(noun, disorder, weakness, fault, illness) |
| ineffectiveness(noun, weakness, skill, failure, lack) |
| ineffectualness(noun, weakness, skill, failure, lack) |
| inefficacy(noun, weakness, skill, failure, lack) |
| inefficiency(noun, weakness, skill, failure, lack) |
| ineptitude(noun, weakness, skill, failure, lack) |
| ineptness(noun, weakness, skill, failure, hopelessness) |
| inexactitude |
| inexactness |
| iniquity(wrong, evil, fault) |
| injury(noun, difficulty, weakness, crack, burden) |
| injustice |
| instability(noun, weakness, fault, lack, lapse) |
| insubstantiality(noun, disorder, weakness, fault, failing) |
| insufficience(noun, weakness, want, need, lack) |
| inutility(noun, weakness, skill, failure, hopelessness) |
| invalidity(noun, weakness, fault, lack, lapse) |