unbelievable

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un·be·liev·a·ble / ˌənbəˈlēvəbəl/ • adj. not able to be believed; unlikely to be true: unbelievable or not, it happened. ∎  so great or extreme as to be difficult to believe; extraordinary: your audacity is unbelievable.DERIVATIVES: un·be·liev·a·bil·i·ty / -ˌlēvəˈbilətē/ n.un·be·liev·a·bly / -ˈlēvəblē/ adv. he worked unbelievably long hours.