Mortalness is a term used to describe the quality or state of being mortal, meaning susceptible to death. However, there are some synonyms that can be used interchangeably to describe this concept. One common synonym for mortality is perishability, which refers to the state of being subject to decay and ultimately ceasing to exist. Another synonym is transience, which describes the transient nature of life, often used to refer to the brief time we have on earth. Finally, vulnerability can also be used as a synonym for mortality, as we are all vulnerable to the inevitability of death. However, regardless of the synonym used, mortality remains an inescapable aspect of human life.