| unsound(adjective, ill, well, unhealthy, frail) |
| unsteady(false, unstable, ill, shaky, insane) |
| unsubstantial(false, unstable, ill, shaky, insane) |
| unsupported |
| ailing(unstable, ill, shaky, insane, unhealthy) |
| defective(ill, unhealthy, frail) |
| delicate(unstable, ill, shaky, insane, unhealthy) |
| diseased(unstable, ill, shaky, insane, unhealthy) |
| erroneous(false, ill, insane, unhealthy, frail) |
| fallacious(false, ill, insane, unhealthy, frail) |
| false(ill, insane, unhealthy, frail, incorrect) |
| faulty(false, ill, insane, unhealthy, frail) |
| frail(ill, unhealthy) |
| ill(unstable, shaky, insane, unhealthy, frail) |
| inaccurate(false, ill, insane, unhealthy, frail) |
| incorrect(false, ill, insane, unhealthy, frail) |
| infirm(unstable, ill, shaky, insane, unhealthy) |
| insane(false, unstable, ill, shaky, unhealthy) |
| invalid(ill, unhealthy, frail) |
| poorly(ill, unhealthy, frail) |