Answer: EERY

AnswerCrossword Clue
EERYLike an "X-Files" episode
EERYUncanny: Var.
EERYLike Serling stories: Var.
EERYLike Serling tales: Var.
EERYCreepy: Var.
EERYChilling: var.
eeryeerie
eeryweird (strange (unusual (not usual)))
EERYLike the warblings in Tennyson's "Sir Launcelot and Queen Guinevere"
EERYMacabre: Var.
EERYOdd, spelled oddly
EERYLike "Scream"
EERYMacabre (var.)
EERYOtherworldly (Var.)
EERYLike a Halloween flick
EERYGhostly: var.
EERYSpooky: var.
EERYStrange (Var.)
EERYHitchcockian (Var.)
EERYWeirdly odd, spelled oddly
EERYUnearthly
EERYSpectral
EERYWeird: Var.
EERYMysterious
EERYLike a haunted house
EERYLike a banshee's wail
EERYCreepy
EERYFrightening, in a way
EERYLike a wax museum
EERYLike the start of "Hamlet"
EERYBone-chilling: Var.
EERYHitchcockian
EERYLike Gothic yarns
EERYLike "The Pit and the Pendulum"
EERYCausing horripilation
EERYGhostly
EERYChilling
EERYSpine-tingling: Var.
EERYLike a Poe tale
EERYUnnerving: Var.