| ineffectual(adjective, dull, light, weak, soft) |
| useless(adjective, weak, poor, failure, base) |
| unavailing(adjective, weak, poor, failure, base) |
| futile(adjective, weak, poor, base, careless) |
| unproductive(adjective, weak, poor, base, silly) |
| bootless(adjective, failure, stupid, idle, useless) |
| fruitless(adjective, weak, failure, silly, stupid) |
| inefficient(adjective, failure, affect, useless, well) |
| worthless(adjective, weak, poor, base, careless) |
| impotent(adjective, weak, poor, failure, silly) |
| feeble(adjective, dull, light, weak, soft) |
| incompetent(adjective, weak, poor, careless, stupid) |
| weak(adjective, dull, light, soft, poor) |
| inefficacious(adjective, affect, useless, incompetent, unsound) |
| vain(adjective, weak, stupid, insignificant, useless) |
| pointless(adjective, poor, base, stupid, inferior) |
| abortive(adjective, failure, stupid, idle, useless) |
| inept(adjective, weak, poor, stupid, idle) |
| inadequate(adjective, dull, light, weak, soft) |
| unable(adjective, weak, inadequate, useless, incompetent) |