| weak(adjective, skill, well, incompetent, unqualified) |
| abortive(failure, inferior, inadequate, limited, feeble) |
| bootless(failure, inferior, inadequate, limited, feeble) |
| dysfunctional(useless, unadaptive) |
| inconsequential |
| slovenly(adjective, well, incompetent, wasteful, unproductive) |
| unapt(useless, incompetent, unqualified, inept, clumsy) |
| uneffective |
| unfitted(weak, inadequate, useless, unqualified, unable) |
| unprepared(adjective, well, incompetent, unqualified, inept) |
| unsatisfactory(adjective, weak, feeble, ineffective, inexpedient) |
| unskilful |
| unworkmanlike(adjective, ability) |
| feckless(inferior, inadequate, limited, feeble, useless) |
| fruitless(adjective, weak, failure, inferior, inadequate) |
| inoperative(weak, skill, inferior, inadequate, feeble) |
| lame(adjective, weak, thin, delicate, inferior) |
| powerless(adjective, weak, thin, delicate, inferior) |
| slack(adjective, well, dubious, incompetent, lazy) |
| sloppy(adjective, well, incompetent, wasteful, unproductive) |