Synonyms:
aeriform, aerial, airy, aery, ethereal
Meaning: characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle; "aerial fancies"; "an airy apparition"; "physical rather than ethereal forms"
Usage examples
What then was this ethereal visitant?
It was ethereal, and perhaps not altogether human, but it was hers.
About her seemed to hover something of the ethereal, elusive, and disquieting.
The columnar formations are topped by globes which emit an ethereal radiance!"