mortal

When used as an adjective, "mortal" can describe a natural state (being born to die) or a specific event (a fatal injury). Be careful not to confuse it with "dead," as "mortal" often refers to the process or inevitability of dying. In the phrase "mortal enemies," the word is used for emphasis to show that the hatred is extreme and permanent, rather than literally meaning they want to kill each other (though that can be part of it). When used as a noun, "mortal" is often paired with the word "mere" (e.g., "a mere mortal") to emphasize human limitations compared to gods or superheroes.