unearthly

Not of this earth; preternatural; supernatural.

Unnaturally strange and frightening. synonym: weird.

Ridiculously unreasonable or uncustomary; absurd.

Not earthly; not terrestrial; supernatural; not like, or as if not proceeding from, anything belonging to the earth; unworldly; hence, weird; appalling.

Not terrestrial; supernatural; preternatural; hence, weird; appalling; terrific.