worrying       
adjective uk/ˈwʌr.i.ɪŋ/ us/ˈwɝː.i.ɪŋ/
B2 令人着急的;令人担忧的
making you feel unhappy and frightened
  It's a very worrying situation. 这种局面真让人担心。 
 - More examples
 - A worrying trend for insurers has been a rise in fraudulent claims.
 - That's the most worrying aspect of the situation.
 - By midweek, the situation had become worrying.
 - He demonstrated a worrying naivety about political issues.
 - I heard something rather worrying at work this morning.