"Hollowed out" is a phrase used to describe something that has been emptied or cleared out from the inside. There are various synonyms for this phrase which can be used to describe this kind of object or structure. "Emptied," "evacuated," "cleared," "depleted," "hollow," "drained," "gutted" and "vacant" are some of the synonyms that can be used for "hollowed out." These synonyms can be used interchangeably depending on the context of the sentence. They are useful when describing objects such as logs, trees, caves, shells, and buildings, among others. Each synonym has its own nuances and connotations, so it's important to select the appropriate one depending on its intended meaning.