Deadites are creatures, most commonly people, that have become possessed by evil spirits (demons) in the Evil Dead universe. However, monsters and creatures released by The Necronomicon Ex-Mortis can be referred to as Deadites as well.
Human beings that have been possessed by a Deadite will exhibit white, pupil-less eyes, dark grey skin, and will also appear to decay rapidly. In The Evil Dead & The Evil Dead 2: Dead By Dawn, when people became possessed, they continued to decay indefinitely. It can be assumed that eventually the host body will decay completely from the demon's corruption. In The Evil Dead, Professor Knowby warned via his tape recordings that he feared the only way to stop those possessed by the demons (Deadites) was through the act of bodily dismemberment. Also in the same film, he warned that the
book said that these enduring creatures may lie dormant but were never truly dead.