Aperion

Aperion comes from the Greek prefix a- (without) and peirar (end, limit, or boundary). First usage has been credited to the pre-Socratic Greek philosopher Anaximander, who, in his search for a cosmological principle, speculated that before "Being" there was aperion, a kind of formless primordial chaos.

Although Anaximander's aim in outlining aperion was simply descriptive, classical Greece would become infamously hostile to the idea. For example, Pythagoras and his followers placed aperion on their list of negatives, and Aristotle suggested that perfection was aligned with limit (peras). Aperion, by extension, was imperfection. Contemporary mathematician Eli Maor calls this classical Greek attitude horror infiniti, or fear of the infinite. https://iep.utm.edu/anaximan/#H2