unbelievable  
adjective uk/ˌʌn.bɪˈliː.və.bəl/ us/ˌʌn.bɪˈliː.və.bəl/
  (SURPRISING)      
 B1 令人震惊的,难以置信的
extremely surprising
  She eats an unbelievable amount of food. 她的食量惊人。 
 You've had such bad luck it's unbelievable. 你的运气这么差,真是令人难以置信。 
 You should see her wardrobe - it's unbelievable - she's got about 50 pairs of shoes. 你该看看她的衣柜——真是不可思议——她有大约50双鞋。 
 - More examples
 - Management have demonstrated almost unbelievable incompetence in their handling of the dispute.
 - That anyone could be treated so badly - it's unbelievable.
 - The cost of the building was unbelievable.
 - His statement showed unbelievable arrogance.
 - It's unbelievable that anyone could be so rude!
 
  (UNLIKELY)      
B2 不能相信的;离谱的
unable to be believed because unlikely
  I thought most of the characters in the play were totally unbelievable. 我发现该剧中的大多数角色都完全不可信。