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1.
Any deceased creature which has been animated through supernatural means to take on the semblance of life, without truly being alive. Only the wraith varies from this definition as it need not pass though death to become undead.
skeletons, zombies, mummies, vampires, wraiths.
by Retroactivism June 19, 2004
 
2.
anyone who listens to hollywood undead and respects their music as an artist myself i reccomend them
one who wears Hollywood Undead clothing or listens to their cds
by D-Tix January 28, 2009
 
3.
The living dead.
Skeletons, zombies, liches, mohrgs, etcetera.
Very unholy and can be injured or even annihalated by holy spells.
Used in fantasy.
The grotesque undead hordes marched onward until the holy paladins drove them back.
by un-dead June 15, 2003
 
4.
Used to describe any living creature that is technically deceased; zombies, vampires, etc.
The army of the undead shall destroy the living world.
by Nosferatu June 20, 2003
 
5.
Anyone who shouldn't be alive, but are still living through the use of magic or excessive amounts of plastic surgery.
Undead may be spiritual, such as ghosts, or corporeal, such as vampires and zombies.
by Muhhrtallicaz December 23, 2007
 
6.
A person that was near death and has been saved by medicine.
Going through undead state is also known as a near death experience.
John got into a car accident and was in a coma for 40 days. The doctor's told John's parents that it was highly unlikely for him to live. Different techniques and medicines made it possible for John to live, so now he is undead.
by Azrielle January 07, 2006