vacant

empty, vacant, blank, void, vacuous mean lacking contents which could or should be present.

empty suggests a complete absence of contents.

vacant suggests an absence of appropriate contents or occupants.

blank stresses the absence of any significant, relieving, or intelligible features on a surface.

void suggests absolute emptiness as far as the mind or senses can determine.

vacuous suggests the emptiness of a vacuum and especially the lack of intelligence or significance.