Negative infinity is a mathematical concept referring to an infinitely small value that is always negative. Its synonyms include "minus infinity," "infinite negative," and "limitless negativity." Another synonym for negative infinity is "unboundedness," which refers to the idea that there is no finite lower limit to a sequence or function. "Eternity" is also sometimes used as a synonym, as it represents the idea of something that is boundless and without end, just like negative infinity. In a more informal context, negative infinity can be described as "bottomless," "endless," or "limitless negativity".