adjective

strange and frightening.

an eerie green glow in the sky

uncanny,sinister,ghostly,spectral,unnatural,unearthly,preternatural,supernatural,other-worldly,unreal,mysterious,strange,abnormal,odd,curious,queer,weird,bizarre,freakish,frightening,spine-chilling,hair-raising,blood-curdling,scaring,terrifying,petrifying,chilling,eldritch,creepy,scary,spooky,freaky,rum