This is the 17290th most frequent Polish word.
zaludniony
Populated.
Here, 'zaludnionym' means 'populated' and describes a place with a large population.
Warszawa jest najbardziej zaludnionym miastem w Polsce.
Warsaw is the most populated city in Poland.
In this sentence, 'zaludnionego' is used to contrast the busy urban center with a quieter rural area.
Po przeprowadzce do wsi zauważyłem, jak różni się od zaludnionego centrum miasta.
After moving to the village, I noticed how it differs from the populated city center.
Here, 'zaludnionych' is used to describe areas that have a significant density of inhabitants.