| feeble(adjective, weak, inadequate, unfit, unqualified) |
| flopping(verb, failing) |
| floundering(verb, failing) |
| flunking(verb, failing) |
| forgetting(verb, forgetting) |
| futile(adjective, lost, vain, ineffective) |
| harm(noun, trouble, hurt, defeat, fall) |
| impotent(adjective, weak, inadequate, unfit, unqualified) |
| incapable(adjective, adequate, unqualified, unable, helpless) |
| incompetent(adjective, weak, inadequate, unfit, unqualified) |
| ineffective(adjective, weak, inadequate, unfit, unqualified) |
| ineligible(adjective, weak, inadequate, unfit, unqualified) |
| inept(adjective, weak, inadequate, unfit, unqualified) |
| inexperienced(adjective, weak, inadequate, unfit, unqualified) |
| inexpert(adjective, weak, inadequate, unfit, unqualified) |
| inproficient(adjective, weak, inadequate, unfit, unqualified) |
| insufficient(adjective, weak, inadequate, unfit, unqualified) |
| loser |
| loses |
| losingly |