| incredible(adjective, unbelievable, implausible, improbable) |
| absurd(unbelievable, implausible, preposterous, improbable) |
| beyond belief(expression, absurd, unbelievable, implausible, preposterous) |
| far-fetched(absurd, unbelievable, implausible, preposterous, improbable) |
| fishy(absurd, unbelievable, implausible, preposterous, improbable) |
| flimsy(absurd, unbelievable, implausible, preposterous, improbable) |
| implausible(unbelievable, improbable) |
| impossible(unbelievable, implausible, improbable) |
| improbable(unbelievable, implausible) |
| incogitable(absurd, unbelievable, implausible, preposterous, improbable) |
| inconceivable(absurd, unbelievable, implausible, preposterous, improbable) |
| insupposable(absurd, unbelievable, implausible, preposterous, improbable) |
| out of the question(expression, idiom, absurd, implausible, preposterous) |
| outlandish(absurd, unbelievable, implausible, preposterous, improbable) |
| phony(unbelievable, implausible, improbable) |
| preposterous(absurd, unbelievable, implausible, improbable) |
| questionable(absurd, unbelievable, implausible, preposterous, improbable) |
| ridiculous(absurd, unbelievable, implausible, preposterous, improbable) |
| suspect(absurd, unbelievable, implausible, preposterous, improbable) |
| thin(unbelievable, implausible, improbable) |