| ill-equipped(adjective, inadequate, useless, unqualified, inexpert) |
| impotent(adjective, weak, skill, inadequate, incompetent) |
| impuissant(weak, skill, inadequate, unfit, inept) |
| incapable of |
| incapacitated(weak, skill, incompetent, unfit, unqualified) |
| inefficacious(weak, skill, inadequate, unfit, inept) |
| inefficient(weak, skill, inadequate, incompetent, unfit) |
| ineligible(adjective, weak, inadequate, incompetent, unfit) |
| inept(adjective, weak, skill, awkward, inadequate) |
| inexperienced(adjective, weak, inadequate, incompetent, unfit) |
| inexpert(adjective, weak, inadequate, incompetent, unfit) |
| inoperative(weak, skill, unfit, inept, powerless) |
| inproficient(adjective, weak, awkward, inadequate, unfit) |
| insufficient(adjective, weak, inadequate, unfit, unqualified) |
| losing(adjective, weak, inadequate, unfit, unqualified) |
| naive(adjective, weak, inadequate, unfit, unqualified) |
| no can do(weak, skill, inadequate, unfit, inept) |
| no good(expression, weak, skill, inadequate, unfit) |
| not able(weak, skill, inadequate, unfit, inept) |
| not cut out for(expression, idiom, weak, skill, inadequate) |