This is the 2281st most frequent Polish word.
sąsiednich
"Adjacent" or "neighboring."
The word "sąsiednich" is the plural genitive masculine form of "sąsiedni," meaning "neighboring." It describes the noun "domów" (houses in genitive plural) as being near or adjacent.
Mieszkańcy sąsiednich domów są bardzo przyjaźni.
The residents of the neighboring houses are very friendly.
Here, "sąsiednich" modifies the noun "krajów" (countries in genitive plural), indicating the countries visited were adjacent or in close proximity.
Odwiedziliśmy sąsiednich krajów podczas naszej podróży.
We visited neighboring countries during our journey.
In this case, "sąsiednich" describes the noun "dzielnic" (districts in genitive plural), highlighting that these districts are near each other geographically.