A phantom, a ghost or elusive entity.
An image or representation of an idea; a representation of an ideal form; an apparition of some actual or imaginary entity, or of some aspect of reality.
An unsubstantial image, spectre, phantom.
A creature that is undead; that is, dead but still animate.
Those creatures which are undead; that is, dead yet still animate.
Being animate, though non-living.
Pertaining to a corpse, though having qualities of life.