| impotent |
| impracticable(adjective, weak, stupid, idle, useless) |
| impractical(adjective, weak, stupid, idle, useless) |
| in vain |
| incompetent(adjective, weak, stupid, idle, useless) |
| inept(adjective, weak, stupid, idle, useless) |
| inoperative(adjective, weak, stupid, idle, useless) |
| inutile(adjective, stupid, idle, useless, incompetent) |
| no go |
| no good(expression, adjective, idiom, stupid, idle) |
| nonfunctional(adjective, weak, stupid, idle, incompetent) |
| profitless(adjective, weak, stupid, idle, incompetent) |
| scrap(adjective, weak, stupid, idle, incompetent) |
| stupid(adjective, weak, idle, useless, incompetent) |
| superfluous |
| unavailable(adjective, weak, stupid, idle, useless) |
| unfunctional(adjective, weak, stupid, idle, incompetent) |
| unproductive(adjective, weak, stupid, idle, useless) |
| unprofitable(adjective, weak, stupid, idle, useless) |
| unpurposed(adjective, weak, stupid, idle, incompetent) |