Nothingness is the ultimate void
It's not just a lack of something, it's a something of nothings.
You could say it's not just an empty space, but rather the space where all the empty spaces go to get their space therapy.
It's the number zero of the nothingness family, but also the sequence of nothings.
In the end, nothingness is just a nihilator, destroying all meaning and purpose with its sheer nothingness-ness.
You could say it's a placeholder for all the things that aren't there, but that would be just a placeholder for a placeholder.