「空っぽ」は、中に何も入っていない様子を表す言葉です。

"空っぽ" is a word that describes the state of having nothing inside.

冷蔵庫やお財布など、いろいろな物が空っぽになると言えます。

You can say that various things like a refrigerator or a wallet are "空っぽ" when they are empty.