| inability(noun, weakness, skill, lack, failing) |
| incapability(noun, weakness, skill, failure, shortcoming) |
| incompetence(noun, weakness, skill, failure, lack) |
| inadequacy(noun, weakness, skill, failure, lack) |
| incapacity(noun, weakness, skill, failure, lack) |
| ineptitude(noun, weakness, skill, failure, lack) |
| ineptness(noun, weakness, skill, failure, shortcoming) |
| ineffectiveness(noun, weakness, skill, failure, lack) |
| inefficacy(noun, weakness, skill, failure, lack) |
| ineffectualness(noun, weakness, skill, failure, lack) |
| clumsiness(noun, stupidity, ignorance, inability, innocence) |
| maladroitness(noun, innocence) |
| awkwardness(noun, innocence) |
| inadequateness(noun, defect, deficiency, inadequacy, shortage) |
| ineffectuality(noun, weakness, slowness, hopelessness, idleness) |
| inaptitude(noun, weakness, skill, failure, shortcoming) |
| disability(noun, impotence) |
| incompetency(noun, weakness, failure, lack, failing) |
| insufficiency(noun, weakness, skill, failure, lack) |
| unfitness(noun, weakness, skill, failure, lack) |