| failing(verb, adjective, failing, vain) |
| impotent(adjective, failure, inferior, inadequate, limited) |
| unfruitful(adjective, inadequate, limited, product, feeble) |
| empty(adjective, useless, trivial, insufficient, worthless) |
| hollow(adjective, useless, trivial, empty, insufficient) |
| otiose(adjective, useless, trivial, empty, insufficient) |
| immature(adjective, inutility, nonpreparation) |
| nugatory(adjective, failure, inferior, inadequate, limited) |
| unrewarding(adjective, arouse bad feelings) |
| counterproductive(adjective, weak, stupid, idle, useless) |
| disastrous(adjective, vain, ineffective, unsuccessful) |
| foiled(adjective, unsuccessful, arouse bad feelings) |
| frustrated(adjective, unsuccessful, arouse bad feelings) |
| inefficient(failure, inferior, inadequate, limited, feeble) |
| miscarried(adjective, failing) |
| thwarted(adjective, unsuccessful, arouse bad feelings) |
| unusable(adjective, weak, stupid, useless, impractical) |
| abortion(noun, failure) |
| botched(adjective, unsuccessful) |
| bungled(adjective, unsuccessful, unproductive, botched) |