If you look it up to the dictionary for the actual meaning of emptiness it will show that is" the state of containing nothing". So if we were a vessel or an object it will hold true as if u have no content, thus, we are empty but humans are not some mere objects so we cannot be understood by our composition thus moving along second meaning from our dictionary, we get what emptiness means is "the quality of lacking meaning or sincerity, meaninglessness" but is it really what we define emptiness as? If a person is living a meaningful with a certain purpose in life, maybe saving some people's as a doctor, or making great creation as an artist; so these person won't ever feel the feeling of emptiness.
Let's put it to some perspective to know how exactly does this emptiness work. Imagine you are having a great party with all of your dear friends and family nearby, even your potential love of the life is here, everyone is happy, everyone is feeling it, there is dance, there is music, the laughter of all the people enjoying, the kids happily running in the background and there is enough alcohol to go around and you wish that this moment could last forever but suddenly the clock strikes eleven , Its late in the night and everyone starts to arrange their stuff, look for their children and they eventually starts searching for you so that they can give you their goodbyes as they leave and be on their merry ways back to their own houses in their own private little life. One by one the number decreases until there is only bottles and cups remains in the floor, although its late at night, you still cannot go to sleep because you have to clean the bottles and cup on the floor, then it suddenly happens you remember the moments earlier when everyone were there smiling and living their best life but this instead of happy you feel sad because there is no one left with you as clean in the after party and you had asked that one person to stay but even they refuse to stay in with you, you can only remember those moments of joys but you cannot relive those moment , that feeling that you get that night when you try to sleep but cannot sleep because you want those moment to return but they simply would not; is the emptiness.
