This is the 12661st most frequent Polish word.
nieczynna
"Nieczynna" means "closed" or "out of service" in English.
Here, 'nieczynna' is used as an adjective to describe the state of the cafe ('kawiarnia'), indicating that it is not open.
Kawiarnia jest dzisiaj nieczynna.
The cafe is closed today.
In this interrogative sentence, 'nieczynna' describes the exhibition ('wystawa') to question its unavailability or closure.
Dlaczego ta wystawa jest nieczynna?
Why is this exhibition closed?
Here, 'nieczynne' is used neutrally to denote the device ('urządzenie') being out of operation for a short period.