| inconceivable(adjective, great, extraordinary, belief, amazing) |
| incredible(adjective, extraordinary, strange, amazing, unbelievable) |
| unbelievable(adjective, extraordinary, strange, amazing, implausible) |
| unimaginable(adjective, extraordinary, strange, amazing, implausible) |
| unthinkable(adjective, extraordinary, unusual, strange, amazing) |
| astonishing(adjective, extraordinary, amazing, dubious, incredible) |
| belief(adjective, extraordinary, strange, unbelievable, implausible) |
| beyond belief(expression, adjective, extraordinary, absurd, implausible) |
| beyond reason(expression, adjective, extraordinary, strange, unbelievable) |
| cockamamie(adjective, extraordinary, amazing, dubious, astonishing) |
| cockeyed(adjective, extraordinary, amazing, dubious, astonishing) |
| doubtful(adjective, extraordinary, amazing, dubious, astonishing) |
| dubious(adjective, extraordinary, amazing, astonishing, incredible) |
| exceptional(adjective, singular, uncommon) |
| extraordinary(adjective, strange, amazing, unbelievable, implausible) |
| fantastic(adjective, extraordinary, strange, unbelievable, implausible) |
| far-fetched(adjective, extraordinary, amazing, absurd, implausible) |
| fishy(adjective, extraordinary, amazing, absurd, implausible) |
| flaky(adjective, extraordinary, amazing, dubious, astonishing) |
| flimsy(adjective, extraordinary, amazing, absurd, implausible) |