Synonyms for Ethereality:

n.

•immateriality (noun)
immateriality, unsubstantiality, spirituality, intangibility, incorporeality, Imponderability, imagination, abstraction.
•unsubstantiality (noun)
mirage, Nihility, unreality, nonexistence, impalpability, emptiness, cipher, nothingness, nullity, phantom, spectre, vacancy, apparition, zero, vacuity, tenuousness, insignificance.