worryingly       
adverb uk/ˈwʌr.i.ɪŋ.li/ us/ˈwɝː.i.ɪŋ.li/
 令人担心地| 令人焦虑地
in a way that makes you feel worried
  Worryingly, the gun was never found. 令人担心的是枪一直没找到。 
 The exam has a worryingly high failure rate. 这个考试的挂科率之高得令人担忧。 
 See: worrying
 - More examples
 - Worryingly, death from lung cancer is still increasing.
 - The plants looked worryingly dry and yellow.
 - More worryingly, there were reports that the disease had spread.