| inferior(inadequate, limited, feeble, useless, vain) |
| innocuous(inferior, inadequate, limited, feeble, useless) |
| inoperative(inferior, inadequate, limited, feeble, useless) |
| lame(inferior, inadequate, limited, feeble, useless) |
| limited(inferior, inadequate, feeble, useless, vain) |
| neutralized(inferior, inadequate, limited, feeble, useless) |
| no go(expression, inadequate, limited, feeble, useless) |
| no way(expression, inadequate, limited, feeble, useless) |
| not effective(expression, inadequate, limited, feeble, useless) |
| nugatory(inferior, inadequate, limited, feeble, useless) |
| powerless(adjective, inadequate, limited, feeble, useless) |
| slack-spined(inadequate, limited, feeble, useless, unpolluted) |
| spineless(inferior, inadequate, limited, feeble, useless) |
| unable(adjective, inferior, inadequate, limited, feeble) |
| unavailable(inadequate, limited, feeble, useless, vain) |
| unavailing(inferior, inadequate, limited, feeble, useless) |
| unfruitful(inadequate, limited, feeble, useless, vain) |
| unproductive(inadequate, limited, feeble, useless, vain) |
| unprofitable(inferior, inadequate, limited, feeble, useless) |
| unsuccessful(inferior, inadequate, limited, feeble, useless) |