| impotent(inferior, inadequate, limited, feeble, useless) |
| inadequate(limited, feeble, useless, vain, unsuccessful) |
| incapacitated(verb, disabled) |
| incompetent(inadequate, limited, feeble, useless, vain) |
| indecisive(inferior, inadequate, limited, feeble, useless) |
| ineffectual(inadequate, limited, feeble, useless, vain) |
| inefficacious(adjective, inferior, inadequate, limited, feeble) |
| inefficient(inferior, inadequate, limited, feeble, useless) |
| inept(inadequate, limited, feeble, useless, vain) |
| inferior(inadequate, limited, feeble, useless, vain) |
| innocent(adjective, clear, pure, healthy, safe) |
| innocuous(adjective, clear, pure, inferior, healthy) |
| innoxious(adjective, clear, sound, pure, healthy) |
| inoffensive(adjective, clear, sound, pure, healthy) |
| inoperative(inferior, inadequate, limited, feeble, useless) |
| interfered(verb, counteracted) |
| lame(inferior, inadequate, limited, feeble, useless) |
| lamed(verb, disabled) |
| limited(inferior, inadequate, feeble, useless, vain) |
| liquidated |