Unearthly (adjective)

Strange, mysterious, or supernatural; not of this world.

Origin:

Middle english: from un- (expressing negation) + earthly, from old english eorþlic "terrestrial".

Examples:

1. The unearthly glow of the Northern Lights was breathtaking.
2. The music had an unearthly quality that was both eerie and beautiful.
3. The unearthly scream sent shivers down her spine.
4. Her eyes had an unearthly gleam that was both mesmerizing and frightening.
5. The painting had an unearthly sense of depth and perspective.