"Not anything" is a commonly used phrase in everyday language that refers to nothing or the absence of anything. However, there are several synonyms that can be used to replace this phrase in order to add some variation to your writing or speaking. Some of the synonyms for "not anything" include "nothing," "zilch," "nada," "zero," "naught," "void," "emptiness," "blankness," "absence," "negation," and "nonentity." All of these synonyms can be used interchangeably with "not anything" to convey the absence of something or the lack of material or substance. Choosing the right synonym can add depth and nuance to your language.