Nothing, put simply, is the deepest, shallowest, brightest, darkest, widest, thinnest, and incomprehensibly empty emptyness, so empty that it is only prevented from collapsing upon itself because there is no substance to collapsae in upon, or no substance to do the collapsing, or even any substance to think or daydream about collapsing upon abscense of prescense or prescense of abscense, which is still utterly and completely absent of form and shape and mass and prescense that is abscent from the existance of anything. In short, nothing is the total, absolute, final, and complete spot that is both positive and negative, young and old, and to sum it all up the opposite of everything in existance, for there is no existance in nothingness. It has even been thought that nothingness itself doesn't even exist, and that the existance of nothingness is so impossibly ludicrous and isnane that if anyone were to actually realize or see nothingness, the entirety of the expanse of the Everything would simply vaporize, leaving even more nothingness in its place.
Nothingness is nothing, to put it simply. (really, this time)