This is the 12782nd most frequent Polish word.
niezaznaczonego
"Unmarked" or "not highlighted."
The word 'niezaznaczonego' is an adjective in the genitive case, describing 'jeziora' (lake), to express that the lake is 'unmarked'.
Na mapie znaleźliśmy miejsce niezaznaczonego jeziora.
On the map, we found the location of an unmarked lake.
Here, 'niezaznaczonego' qualifies 'obiektu' (object) in the genitive case, showing possession or relation and describes the object as 'unmarked'.
Szukaliśmy informacji o niezaznaczonego obiektu w dokumentach.
We were looking for information about an unmarked object in the documents.
In this example, 'niezaznaczonego' modifies 'numeru telefon' (phone number) in genitive case, again characterizing the phone number as 'unmarked'.