This is the 7044th most frequent Polish word.
hawelańskiej
"Hawelańskiej" is a declined form (genitive singular or related possessive) of "hawelańska," which is an adjective derived from "Hawela," the Polish name for the Havel River, often referring to something related to that region.
Here, "hawelańskiej" is used as an adjective to describe a type of architecture style associated with Havel, implying Havelian characteristics.
Piękno stylu hawelańskiej architektury zachwyca wielu turystów.
The beauty of Havel-style architecture amazes many tourists.
In this case, "hawelańskiej" modifies "galerii" to specify the gallery's association with Havel, denoting a unique identity or origin.
Podziwiałam obrazy w hawelańskiej galerii sztuki.
I admired the paintings in the Havelian art gallery.
Here, "hawelańskiej" refers to an exhibition related to Havel, used in the genitive form to express belonging or characteristic emphasis.