unthinkable

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un·think·a·ble / ˌənˈ[unvoicedth]ingkəbəl/ • adj. (of a situation or event) too unlikely or undesirable to be considered a possibility: it was unthinkable that John could be dead | [as n.] (the unthinkable) the unthinkable happened—I spoke up. DERIVATIVES: un·think·a·bil·i·ty / -ˌ[unvoicedth]ingkəˈbilitē/ n.un·think·a·bly / -blē/ adv. a land of unthinkably vast spaces.