This is the 17281st most frequent Polish word.
zaległego
"Zaległego" means "overdue" or "outstanding."
Here, 'zaległego' is an adjective in the genitive case modifying the noun 'czynszu' (rent), indicating that the rent is overdue.
Muszę zapłacić zaległego czynszu.
I need to pay the overdue rent.
In this instance, 'zaległego' describes the noun 'e-maila' in the accusative case, showing that the email is delayed or overdue.
Otrzymałem zaległego e-maila dotyczącą projektu.
I received the delayed email regarding the project.
Here, 'zaległego' modifies 'rozdział' (chapter) in the accusative case, signifying that the reading of the chapter was pending or overdue.