This is the 12712th most frequent Polish word.
niepilnowanego
"Unattended" or "not being watched over."
The word 'niepilnowanego' describes the dog that is not being watched or supervised by anyone.
Znalazłem na ulicy niepilnowanego psa.
I found an unattended dog on the street.
Here 'niepilnowanego' refers to luggage that is not being looked after or monitored.
Niepilnowanego bagażu nie należy zostawiać na dworcu.
Unattended luggage should not be left at the station.
'Niepilnowanego' modifies 'dziecko,' indicating it is not being supervised.