Ethereal (adjective)

1. Extremely delicate and light in a way that seems not to be of this world.
2. Very refined or subtle and lacking any material substance.

Origin:

Late middle english: via latin from greek aithērios "upper air", "heavenly", from aithēr "upper air".

Examples:

1. The ballerina floated across the stage with an ethereal grace.
2. Her voice was ethereal, like a choir of angels.
3. The ethereal landscape was painted with an almost otherworldly quality.
4. The ethereal beauty of the city was like a dream come to life.
5. The ethereal quality of the music made it seem as though it was coming from another dimension.