| unskilful |
| unwell(sick, unhealthy, sickly, flabby) |
| unworkable(adjective, inapplicable) |
| valueless(adjective, appropriate, inappropriate, unsuitable, worthless) |
| abnormal(adjective, wrong, false, awkward, inadequate) |
| absurd(adjective, ridiculous) |
| ailing(adjective, sick, unhealthy, unwell, sickly) |
| bad form(expression, adjective, wrong, false, awkward) |
| blight(harm, spoil, weaken) |
| careless(incompetent, wasteful, unproductive) |
| contemptible(adjective, mean, simple, poor, inferior) |
| critical(negative, disapproving, uncomplimentary) |
| deaden(verb, impotence) |
| debilitate(verb, stop, hurt, ruin, restrain) |
| deficient |
| discommodious(negative, disapproving, inexpedience, uncomplimentary) |
| discreditable(adjective, improper, incorrect, unsuitable) |
| discrepant(adjective, wrong, false, awkward, inadequate) |
| diseased(sick, unhealthy, unwell, sickly, flabby) |
| disgraceful(worthless, unworthy, undeserving) |