tertutup

Tertutup is an Indonesian adjective meaning "closed" or "sealed." It is formed from the root tutup, meaning "to close," with the prefix ter-, which in Indonesian often indicates a state resulting from a previous action or a inherent condition. As a result, tertutup describes a condition rather than an ongoing activity.

In everyday usage, tertutup typically refers to physical closure, such as pintu tertutup (the door is closed) or jendela tertutup (the window is shut). It also extends to abstract or figurative meanings, including data or information that is restricted or confidential (data tertutup) and social media accounts that are private (akun media sosial tertutup).

The term appears in various contexts:

- Physical environment: ruang tertutup (enclosed space), ruangan tertutup (closed room).

- Systems and processes: sistem tertutup (closed system) in thermodynamics or information flow.

- Attitudes and perceptions: berpikir tertutup (closed-minded) or pola pikir tertutup (closed mindset).

Antonyms include terbuka, meaning "open." The word can be contrasted with terbuka in contexts ranging from physical doors to openness of information or attitudes. In usage, tertutup conveys a stable condition rather than a momentary action, and it is commonly applied across formal and informal registers in Indonesian.