pusta

In a sentence

• Szafa jest pusta.

  The wardrobe is empty.

  Here, 'pusta' is used as an adjective describing the state of the wardrobe, indicating that it contains nothing.

• Zauważyłem pustą stronę w książce.

  I noticed an empty page in the book.

  'Pustą' is an adjective agreeing with 'stronę,' describing the attribute of the page lacking content.

• Ulica wyglądała pusto o tej porze.

  The street looked empty at this time.

  In this sentence, 'pusto' is an adverb describing how the street appeared, showing its barrenness or lack of people/activity.