troublingly       
adverb uk/ˈtrʌb.əl.ɪŋ.li/ us/ˈtrʌb.əl.ɪŋ.li/
 令人忧虑地
in a way that causes worry 
  The plan he announced was troublingly vague. 他宣布的计划含糊不清令人忧虑。 
 We were both realising how troublingly complex our interactions had become. 我们俩都意识到了我们之间的沟通已经变得复杂到令人忧虑的地步。 
 See: troubling
 - More examples
 - Troublingly, the country shows no sign of giving up the dangerous technologies it has developed.
 - Arrests related to underage drinking are troublingly high.
 - They are small in number but can seem troublingly influential.