unimaginable
adj. 不可思议的;难以想像的
例句
The scale of the fighting is almost unimaginable.
战斗的规模几乎难以想像。
《柯林斯英汉双解大词典》
This level of success would have been unimaginable just last year.
取得这样的成就,这在仅仅一年前都是不敢想象的。
《牛津词典》
Now his future lay plain before him, and glowing with unimaginable splendor.
现在,他的未来展现在他面前,闪耀着难以想象的光辉。