unnervingly       
adverb uk/ʌnˈnɜː.vɪŋ.li/ us/ʌnˈnɝː.vɪŋ.li/
 令人丧失信心地|令人恐惧地
in a way that makes you feel less confident and slightly frightened
  The gunfire is unnervingly close at times. 炮火有时会逼近,近得令人惊心胆寒。 
 He sees an actor who looks unnervingly like him. 他看到一名和他长得惊人相似的演员。 
 See: unnerve
 - More examples
 - There is something unnervingly familiar about the policemen who have been sent to keep them safe.
 - The room was full of portraits of long-dead ancestors whose eyes followed her unnervingly.
 - The approaching bird looked unnervingly like an aircraft.