ethereal

adjective

1. 1

   Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; otherworldly.

   “ethereal space ethereal regions”

2. 2

   Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.

3. 3

   Delicate, light and airy.

4. 4

   To do with ether.

   “an ethereal solution”