This is the 14703rd most frequent Polish word.
pusta
"Empty."
Here, 'pusta' is used as an adjective describing the state of the wardrobe, indicating that it contains nothing.
Szafa jest pusta.
The wardrobe is empty.
'Pustą' is an adjective agreeing with 'stronę,' describing the attribute of the page lacking content.
Zauważyłem pustą stronę w książce.
I noticed an empty page in the book.
In this sentence, 'pusto' is an adverb describing how the street appeared, showing its barrenness or lack of people/activity.