morskiego
Morskiego is the genitive singular form of the Polish adjective morski, which means sea-related or marine. As a grammatical form, it does not stand alone as a distinct lexical item; rather, it is an inflected form used to modify nouns in the genitive case and to express possession or association in phrases.
In Polish, adjectives agree with the nouns they describe in gender, number, and case. Morskiego is used
Morskiego also appears as the genitive form of the surname Morski. In that sense, it functions similarly
In summary, morskiego is the genitive singular inflection of the adjective morski, used for masculine or neuter