| incredible(adjective, great, flat, poor, thin) |
| improbable(adjective, great, slight, flat, poor) |
| unbelievable(adjective, hard, weak, great, flat) |
| preposterous(adjective, hard, great, difficult, extraordinary) |
| inconceivable(adjective, great, flat, poor, thin) |
| unlikely(adjective, slight, extraordinary, strange, superb) |
| farfetched(adjective, hard, difficult, likely, unlikely) |
| doubtful(adjective, extraordinary, fantastic, amazing, dubious) |
| fantastic(adjective, extraordinary, strange, superb, amazing) |
| dubious(adjective, great, slight, extraordinary, amazing) |
| unconvincing(adjective, weak, great, flat, poor) |
| fishy(adjective, extraordinary, fantastic, amazing, doubtful) |
| unthinkable(adjective, extraordinary, unusual, strange, amazing) |
| weak(adjective, great, poor, extraordinary, strange) |
| extravagant(adjective, strange, crazy, insane, absurd) |
| impossible(adjective, hard, great, difficult, extraordinary) |
| absurd(adjective, hard, difficult, false, strange) |
| far-fetched(adjective, hard, extraordinary, fantastic, amazing) |
| unreasonable(adjective, hard, poor, difficult, thin) |
| flimsy(adjective, weak, poor, thin, unreasonable) |