| unknowable(adjective, extraordinary, belief, strange, unbelievable) |
| unlikely(adjective, extraordinary, strange, unbelievable, implausible) |
| unsubstantial(adjective, extraordinary, strange, unbelievable, implausible) |
| unthinkable(adjective, extraordinary, strange, unbelievable, implausible) |
| weak(adjective, extraordinary, strange, unbelievable, implausible) |
| absurd(adjective, unbelievable, implausible, preposterous, improbable) |
| beyond belief(expression, adjective, absurd, implausible, preposterous) |
| extraordinary(adjective, strange, unbelievable, implausible, unthinkable) |
| far-fetched(adjective, absurd, unbelievable, implausible, preposterous) |
| fishy(adjective, absurd, unbelievable, implausible, preposterous) |
| flimsy(adjective, absurd, unbelievable, implausible, preposterous) |
| mind-blowing(unbelievable, unthinkable, unimaginable) |
| out of the question(expression, adjective, idiom, absurd, implausible) |
| outlandish(adjective, absurd, unbelievable, implausible, preposterous) |
| preposterous(adjective, absurd, unbelievable, implausible, improbable) |
| questionable(adjective, absurd, unbelievable, implausible, preposterous) |
| ridiculous(adjective, absurd, unbelievable, implausible, preposterous) |
| rings phony(expression, adjective, absurd, implausible, preposterous) |
| strange(adjective, extraordinary, unbelievable, implausible, unthinkable) |
| suspect(adjective, absurd, unbelievable, implausible, preposterous) |