This is the 17119th most frequent Polish word.
włoskiego
"Włoskiego" means "Italian" (genitive or accusative singular masculine or neuter form, or singular feminine form in some contexts).
Here, 'włoskiego' is used as an adjective describing 'języka' (language) in the genitive singular form, indicating 'of Italian' language.
Uczę się włoskiego języka.
I am learning the Italian language.
In this usage, 'włoskiego' serves as an adjective describing 'wina' (wine) in the genitive singular form, showing the origin or type of the wine.
Kupiliśmy trochę włoskiego wina.
We bought some Italian wine.
Here, 'włoskiego' modifies 'malarza' (painter) in the genitive singular form, signifying that the painter is of Italian origin.