ethereal in WordNet English dictionary

1. 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"
   aeriform  aerial  airy  aery  ethereal 
   
2. of heaven or the spirit
   "celestial peace"; "ethereal melodies"; "the supernal happiness of a quiet death"
   celestial  ethereal  supernal 
   
3. of or containing or dissolved in ether
   "ethereal solution"
   ethereal 
   
4. characterized by unusual lightness and delicacy
   "this smallest and most ethereal of birds"; "gossamer shading through his playing"
   ethereal  gossamer