| inept(adjective, weak, ability, inadequate, limited) |
| incompetent(adjective, weak, ability, thin, delicate) |
| ineffective(adjective, failure, affect, useless, well) |
| ineffectual(adjective, weak, thin, delicate, failure) |
| incapable(adjective, weak, ability, inadequate, feeble) |
| useless(adjective, weak, failure, inferior, affect) |
| feeble(adjective, strong, weak, inadequate, useless) |
| unfit(adjective, weak, ready, inadequate, well) |
| unskilled(adjective, weak, ability, inadequate, useless) |
| unable(adjective, weak, skill, inadequate, limited) |
| inexpert(adjective, weak, ability, inadequate, well) |
| inefficacious(adjective, weak, skill, inferior, affect) |
| unqualified(adjective, well, educated, overall, well-informed) |
| half-assed |
| futile(adjective, weak, inferior, inadequate, limited) |
| impotent(adjective, weak, thin, delicate, failure) |
| inadequate(adjective, weak, thin, delicate, inferior) |
| inferior(inadequate, limited, feeble, useless, vain) |
| unavailing(weak, failure, inferior, inadequate, limited) |
| unproductive(adjective, weak, slow, inadequate, limited) |