| inefficacious(adjective, useless, fruitless, impaired, inoperable) |
| unusable(adjective, weak, stupid, useless, impractical) |
| incapable(adjective, ineffective, defective, impaired, inoperable) |
| incompetent(adjective, weak, stupid, idle, useless) |
| counter-productive(adjective, useless, fruitless, impaired, inoperable) |
| good-for-nothing(adjective, weak, stupid, idle, useless) |
| inactive(adjective, useless, fruitless, impaired, inoperable) |
| invalid(adjective, ineffective, defective, impaired, inoperable) |
| useless(adjective, weak, stupid, valuable, impractical) |
| nonfunctional(adjective, weak, stupid, idle, useless) |
| effectless(adjective, useless, flawed, faulty, fruitless) |
| ineffectual(adjective, weak, stupid, idle, useless) |
| abnormal functioning(expression, feature, characteristic, state) |
| impaired functioning(expression, feature, characteristic, state) |
| not operating normally(expression, feature, characteristic, state) |
| not operating properly(expression, feature, characteristic, state) |
| ineffective(adjective, weak, stupid, idle, useless) |
| inefficient(adjective, useless, flawed, faulty, impaired) |
| out of action(feature, characteristic, state, expression) |
| out of whack(feature, characteristic, state, expression) |