Ethereal
Etymology
From "ether," through Latin "aether" from Greek "aithēr" ("the bright upper air," where the gods were thought to dwell), from "aithein" ("to burn, shine"). Because that upper region was imagined as pure and heavenly, "ethereal" came to describe things that feel delicate, airy, and unearthly.
adjective · /ih-THEER-ee-ul/
Extremely delicate and light, in a way that seems too perfect or otherworldly for the physical world.
What it names
The quality of something so airy and refined it seems to belong to the heavens rather than the earth — a voice, a mist, a beauty.
Example
The choir’s ethereal harmonies seemed to float somewhere above the congregation.
Related idea
Celestial means literally of the sky or heavens; ethereal borrows that heavenly feel to describe delicate, unearthly beauty found here on earth.