| incompetent(adjective, weak, inferior, inadequate, limited) |
| indecisive(inadequate, limited, feeble, useless, vain) |
| inefficient(inadequate, limited, feeble, useless, vain) |
| inept(adjective, weak, inferior, inadequate, limited) |
| inferior(inadequate, limited, feeble, useless, vain) |
| infructuous |
| innocuous(inadequate, limited, feeble, useless, vain) |
| insignificant |
| invalid(adjective, meaningless, unsubstantiated, unsupported, annulled) |
| lacking(adjective, poor, small, insignificant, unimportant) |
| lame(inadequate, limited, feeble, useless, vain) |
| lamentable(adjective, poor, small, insignificant, unimportant) |
| lank(adjective, thin, spare, bare, slim) |
| lanky(adjective, thin, spare, bare, slim) |
| leached |
| limited(slight, inadequate, feeble, useless, vain) |
| malnourished(adjective, poor, small, insignificant, unimportant) |
| meaningless(adjective, invalid, unsubstantiated, unsupported, annulled) |
| menopausal |
| narrow(adjective, poor, small, insignificant, unimportant) |