wieczystego
Wieczystego is the genitive singular form of the Polish adjective wieczysty, meaning perpetual, eternal or lasting for a very long time. The form is used in Polish to modify masculine singular nouns in the genitive case, for example in legal phrases such as prawa wieczystego użytkownika or umowy wieczystego użytkowania. In general, wieczysty as an adjective agrees with the noun it describes in gender, number and case, so wieczystego appears whenever the noun is masculine singular and in the genitive.
In Polish law the term is particularly associated with the concept of wieczyste użytkowanie, commonly translated
Beyond legal contexts, wieczystego can occur in historical or formal prose when the adjective describes a masculine
See also: Użytkowanie wieczyste, Wieczysty (adjective), Wieczność.