Wiktionary
undeath
n. The state of being undead
Usage examples of "undeath".
The air was pungent with undeath, the gelid exhalation of dying ice, filled with something like loss.
Thankfully none were stirring in undeath, he was running late as it was and never liked to hurry the fun part.
Again, Histra was caught by the fact that she had not yet mastered her new state of undeath, that she could not quickly and easily transform into a bat or some other creature of the night, or melt into vapors and flow away.