unthinkable

形容词 unthinkable:

1. incapable of being conceived or considered

1. Raising taxes was politically unthinkable.
   增加税收在政治上来讲是不能考虑的
2. It is unthinkable that we shall allow a nuclear holocaust to occur.
   我们若竟让核武器大屠杀的惨剧发生，简直是匪夷所思。
3. It was next to unthinkable that the hunchback came down to the rope as quickly as a monkey.
   驼背人从绳子上像猴子一样地滑下来几乎是不可想象的。