Empty is the broadest and can apply to what lacks contents (an empty box),. The president who once filled sports venues across the country couldn't even come. Empty suggests a complete absence of contents.
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Not containing any things or people: Donald trump's ability to pack arenas is evaporating. Having none of the usual or appropriate contents.
Not sincere or without any real meaning:
See examples of empty used in a sentence. Empty, vacant, blank, void, vacuous mean lacking contents which could or should be present. These adjectives mean without contents that could or should be present.