| fruitless(adjective, weak, stupid, idle, useless) |
| inadequate(adjective, useless, impractical, hopeless, unusable) |
| insurmountable(adjective, impossible) |
| pointless(weak, stupid, idle, useless, incompetent) |
| ridiculous(silly, foolish, fantastic, unwise, impractical) |
| speculative(adjective, wild, unreasonable, useless, absurd) |
| theoretical(adjective, wild, silly, unreasonable, useless) |
| unavailing(weak, stupid, idle, useless, incompetent) |
| unfit(adjective, inapplicable) |
| unobtainable(adjective, impossible) |
| unreal(adjective, wild, silly, unreasonable, useless) |
| wild |
| worthless(adjective, weak, stupid, idle, incompetent) |
| Utopian |
| bootless(weak, stupid, idle, useless, incompetent) |
| chimerical(adjective, wild, unreasonable, useless, absurd) |
| duff |
| fantastic(silly, foolish, unwise, romantic, impractical) |
| good-for-nothing(adjective, weak, stupid, idle, useless) |
| implausible(adjective, impossible) |