aktywnym

aktywnym is the instrumental case form of the Polish adjective aktywny, meaning active or engaged. It is used to modify masculine nouns in the instrumental case and often appears in phrases expressing involvement, participation, or activity, for example: "aktywnym uczestnikiem projektu" (an active participant in the project) and "z aktywnym udziałem" (with active participation). The form emphasizes active engagement rather than mere presence.

In gendered declension, "aktywnym" is the masculine singular instrumental form; the corresponding feminine form is "aktywną" and the plural instrumental form is "aktywnymi". The adjective can describe a person, role, or action: "aktywny pracownik" (an active employee) in the nominative becomes "aktywnym pracownikiem" in the instrumental.

The term is common across professional and academic registers. It is frequently used in descriptions of participation, behavior, and initiative, as well as in educational and organizational contexts to characterize people who take initiative or contribute actively. As with other Polish adjectives, "aktywny" generally conveys a positive attribute, but its exact nuance is determined by context.