Some common synonyms of void are blank, empty, vacant, and vacuous. While all these words mean "lacking contents which could or should be present," void suggests absolute emptiness as far as the mind or senses can determine.

// a statement void of meaning

The synonyms empty and void are sometimes interchangeable, but empty suggests a complete absence of contents.

// an empty bucket

Although the words vacuous and void have much in common, vacuous suggests the emptiness of a vacuum and especially the lack of intelligence or significance.

// a vacuous facial expression