| unbelievable(adjective, extraordinary, belief, amazing, implausible) |
| unthinkable(adjective, extraordinary, unusual, belief, amazing) |
| inconceivable(adjective, extraordinary, belief, amazing, absurd) |
| incredible(adjective, extraordinary, belief, amazing, unbelievable) |
| unimaginable(adjective, extraordinary, belief, amazing, implausible) |
| absurd(adjective, unbelievable, implausible, preposterous, improbable) |
| implausible(adjective, extraordinary, amazing, unbelievable, incredible) |
| preposterous(adjective, extraordinary, amazing, absurd, unbelievable) |
| ridiculous(adjective, absurd, unbelievable, implausible, preposterous) |
| cockamamie(extraordinary, amazing, incredible) |
| doubtful(extraordinary, amazing, incredible) |
| dubious(extraordinary, amazing, incredible) |
| fantastic(adjective, unbelievable, unthinkable, unimaginable) |
| open to doubt(expression, idiom, extraordinary, amazing, incredible) |
| questionable(extraordinary, amazing, absurd, implausible, preposterous) |
| suspect(extraordinary, amazing, absurd, implausible, preposterous) |
| thick(extraordinary, amazing, incredible) |
| thin(adjective, extraordinary, amazing, unbelievable, implausible) |
| unconvincing(adjective, extraordinary, amazing, unbelievable, implausible) |
| unreal |