This is the 12717th most frequent Polish word.
niepokojącego
"Niepokojącego" means "disturbing" or "unsettling" in English.
The word "niepokojącego" is used as an adjective in its accusative neuter singular form to describe something that causes concern or worry.
Usłyszałem coś niepokojącego w wiadomościach.
I heard something disturbing in the news.
Here, "niepokojącego" functions as an adjective in the genitive neuter singular form, describing the concept of behavior that triggers concern.
Zaobserwowano wiele niepokojącego zachowania wśród dzieci.
Many disturbing behaviors were observed among the children.
The word "niepokojącego" describes the distressing quality of his facial expression; it is an adjective in its accusative neuter singular form.