Hollow

"Hollow" describes something that is empty or has a space inside it, rather than being solid. For example, a hollow tree has a cavity inside, and a hollow ball is open through the center. This term can also refer to feelings or qualities, such as feeling hollow when experiencing emptiness or lack of meaning. In general, "hollow" emphasizes the presence of an inner cavity or emptiness within an object or concept, distinguishing it from solid, filled, or complete forms.