| hog-tied(weak, skill, unfit, inept, powerless) |
| impaired |
| imperfect |
| impotent(weak, skill, incompetent, unfit, unqualified) |
| impuissant(weak, skill, inadequate, unfit, inept) |
| inadequate(poor, skill, useless, unfit, inept) |
| incapable(weak, inadequate, useless, unqualified, inept) |
| incapacitated(weak, skill, incompetent, unfit, unqualified) |
| incompetent(adjective, weak, skill, inadequate, useless) |
| incomplete |
| ineffective(incompetent, wasteful, unproductive) |
| ineffectual(skill, inadequate, useless, inept, unable) |
| inefficacious(weak, skill, inadequate, incompetent, unfit) |
| inefficient(adjective, weak, inadequate, useless, well) |
| ineligible(inadequate, useless, incompetent, unqualified, inept) |
| inept(weak, skill, inadequate, unfit, unqualified) |
| inexperienced(inadequate, useless, incompetent, unqualified, inept) |
| inexpert(inadequate, useless, incompetent, unqualified, inept) |
| inferior |
| infrequent |