spookish

Like a spook or ghost; ghostly.

Given over to spooks; congenial to ghosts; haunted: as, a spookish house.

Affected by a sense or fear of ghosts; suggestive of the presence or agency of spooks: as, a spookish circumstance; a spookish sensation.

Frightening or unnerving in the manner of something eerie or supernatural; spooky.

Easily startled, frightened, or unnerved.