| inconstancy(noun, weakness, fault, lack, lapse) |
| indecision(noun, weakness, fault, lack, lapse) |
| inefficiency(noun, weakness, skill, failure, shortcoming) |
| ineptness(noun, weakness, skill, failure, shortcoming) |
| inertness |
| injury(noun, inability) |
| instability(noun, weakness, fault, lack, lapse) |
| inutility(noun, weakness, skill, failure, shortcoming) |
| invalidity(noun, weakness, fault, lack, lapse) |
| irrelevancy |
| lack(noun, weakness, skill, failure, fault) |
| lapse(noun, weakness, fault, lack, failing) |
| lassitude |
| liking(noun, weakness, fault, lack, lapse) |
| necessity(noun, weakness, skill, failure, shortcoming) |
| penchant(noun, weakness, fault, lack, lapse) |
| predilection(noun, weakness, fault, lack, lapse) |
| proclivity(noun, weakness, fault, lack, lapse) |
| proneness(noun, fault, lack, lapse, failing) |
| puniness |