"ethereal" in the adjective sense
1. aeriform, aerial, airy, aery, ethereal
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"
2. ethereal
of or containing or dissolved in ether
"ethereal solution"
3. celestial, ethereal, supernal
of heaven or the spirit
"celestial peace"
"ethereal melodies"
"the supernal happiness of a quiet death"
4. ethereal, gossamer
characterized by unusual lightness and delicacy
"this smallest and most ethereal of birds"
"gossamer shading through his playing"
Source: WordNet® (An amazing lexical database of English)
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