(adj): vs. unventilated) -- (exposed to air
(adj): not practical or realizable; speculative
(adj): vs. dystopian) -- (characterized by or aspiring to impracticable perfection
(adj): having little or no perceptible weight; so light as to resemble air
(adj): vs. heavy) -- (of comparatively little physical weight or density
(adj): characterized by lightness and insubstantiality; as impalpable or intangible as air
(adj): vs. substantial), unsubstantial, unreal -- (lacking material form or substance; unreal
I would agree with this, rolig, if the expression airy-fairy weren't so common amoungst Bay Area cynics.
Ethereal but without the mumbo-jumbo. See Skipvia's list Free Association.