| inefficacious(adjective, inferior, inadequate, useless, trivial) |
| infertile(adjective, product, useless, empty, bleak) |
| hollow(adjective, useless, trivial, stiff, empty) |
| impotent(adjective, weak, failure, silly, stupid) |
| unrewarding(adjective, flat, difficult, unpleasant, useless) |
| failed(adjective, unsuccessful, arouse bad feelings) |
| gainless(adjective, product, inutility) |
| inoperative(adjective, weak, stupid, inferior, idle) |
| otiose(adjective, useless, trivial, empty, insufficient) |
| thwarted(adjective, unsuccessful, arouse bad feelings) |
| dry |
| effete(adjective, unproductive, inutility) |
| fallow |
| foiled(adjective, unsuccessful, arouse bad feelings) |
| frustrated(adjective, unsuccessful, arouse bad feelings) |
| inane(adjective, dull, stupid, insignificant, useless) |
| meaningless(adjective, stupid, insignificant, idle, useless) |
| nugatory(adjective, failure, inferior, inadequate, limited) |
| poor(adjective, weak, unsatisfactory, impaired, unfulfilling) |
| sleeveless |