ADJ-GRADED 不可想象的;难以理解的;异乎寻常的 If you describe something as unimaginable, you are emphasizing that it is difficult to imagine or understand properly, because it is not part of people's normal experience. 不可想象的;难以理解的;异乎寻常的 [emphasis]
The scale of the fighting is almost unimaginable.
战斗的规模几乎无法想象。
The children here have lived through unimaginable horrors.