If you say that something is unbelievable, you are emphasizing that it is very good, impressive, intense, or extreme.
incredible
His guitar solos are just unbelievable.
他的吉他独奏简直妙得令人难以置信。
The pressure they put us under was unbelievable.
他们让我们承受的压力大得令人难以置信。
You can use unbelievable to emphasize that you think something is very bad or shocking.
incredible
I find it unbelievable that people can accept this sort of behaviour.
人们竟然能接受这种行为,我感到难以相信。
If an idea or statement is unbelievable, it seems so unlikely to be true that you cannot believe it.
I still find this story both fascinating and unbelievable.
我仍然觉得这个故事既有趣又让人难以置信。