spookish

adjective2

1. •
   (informal) Frightening or unnerving in the manner of something eerie or supernatural; spooky.

   • I hope we find some nicer spot than this. This looks so lonely and spookish. — 1914
2. •
   (informal) Easily startled, frightened, or unnerved.

   • In those moments thus spent in composing myself for sleep, I sometimes wondered in the last human occupant of the room were not a dead one. I was senselessly spookish about such things. — 1908