repellent — causing distaste or aversion; repulsive.
repulsive — causing repugnance or aversion: a repulsive mask.
sepulchral — of, relating to, or serving as a tomb.
spectral — of or relating to a specter; ghostly; phantom.
supernatural — of, relating to, or being above or beyond what is natural; unexplainable by natural law or phenomena; abnormal.
uncanny — having or seeming to have a supernatural or inexplicable basis; beyond the ordinary or normal; extraordinary: uncanny accuracy; an uncanny knack of foreseeing trouble.
unearthly — seeming not to belong to this earth or world: unearthly beauty.
unnatural — contrary to the laws or course of nature.
weak — not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor.
wraithlike — an apparition of a living person supposed to portend his or her death.
spooky — like or befitting a spook or ghost; suggestive of spooks.
eerie — uncanny, so as to inspire superstitious fear; weird: an eerie midnight howl.
shadowy — resembling a shadow in faintness, slightness, etc.: shadowy outlines.
weird — involving or suggesting the supernatural; unearthly or uncanny: a weird sound; weird lights.
apparitional — of or relating to an apparition or apparitions; ghostly, spectral
divine — of or relating to a god, especially the Supreme Being.
ghostlike — the soul of a dead person, a disembodied spirit imagined, usually as a vague, shadowy or evanescent form, as wandering among or haunting living persons.
haunted — inhabited or frequented by ghosts: a haunted castle.
holy — specially recognized as or declared sacred by religious use or authority; consecrated: holy ground.