This is the 435th most frequent Turkish word.
kapalı
"Kapalı" means "closed" in English.
Here, 'kapalı' is used to mean 'closed,' describing the state of access to the room being restricted.
Oda kapalı, çünkü temizlik yapılıyor.
The room is closed because cleaning is being done.
In this sentence, 'kapalı' describes the cloudy condition of the weather, indicating an overcast sky.
Bugün hava çok kapalı, yağmur yağabilir.
Today, the weather is very cloudy; it may rain.
Here, 'kapalı' is used to describe the state of the box being shut or sealed before opening.