eldritch

/ˈɛldrɪtʃ/
adjective
  1. Strange, eerie, or unnatural in a way that suggests something supernatural or otherworldly.
    • The story described an eldritch creature that lived in the shadows.
    • He painted an eldritch landscape with twisted trees and a blood-red sky.
    • The eldritch howl from the cave made everyone freeze.