| impracticable(adjective, unreasonable, possible, impossible, out-of-the-way) |
| impractical(adjective, unreasonable, possible, impossible, unpractical) |
| unattainable(adjective, unreasonable, possible, inaccessible, impossible) |
| unworkable(adjective, unreasonable, possible, inaccessible, impossible) |
| impossible(adjective, unreasonable, possible, inaccessible, unreachable) |
| unachievable(adjective, impossible) |
| infeasible(adjective, unreasonable, inaccessible, impossible, unreachable) |
| undoable |
| unfeasible(adjective, unreasonable, impossible, out-of-the-way, unapproachable) |
| unrealistic(adjective, unreasonable, unpractical, unviable) |
| absurd(adjective, unreasonable, impossible, unpractical, unfeasible) |
| hopeless(adjective, impossible) |
| inaccessible(adjective, out, impossible) |
| quixotic(adjective, unreasonable, unpractical, unviable) |
| visionary(adjective, unreasonable, impossible, unpractical, unfeasible) |
| inconceivable(adjective, impossible) |
| insurmountable(adjective, impossible) |
| preposterous(adjective, impossible) |
| unreasonable(adjective, impossible, unpractical, unfeasible, unviable) |
| unthinkable(adjective, possible, impossible) |