ethereal

adjective

1. 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

2. 2

   characterized by unusual lightness and delicacy

   this smallest and most ethereal of birds

   gossamer shading through his playing

3. 3

   of heaven or the spirit

   celestial peace

   ethereal melodies

4. 4

   of or containing or dissolved in ether

   ethereal solution