The Collaborative International Dictionary of English v.0.48:

Intangibility \In*tan`gi*bil"i*ty\, n.; pl. Intangibilities.
   [Cf. F. intangibilit['e].]
   The quality or state of being intangible; intangibleness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intangibility
    n 1: the quality of being intangible and not perceptible by
         touch [syn: intangibility, intangibleness,
         impalpability] [ant: palpability, tangibility,
         tangibleness]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "intangibility":
   airiness, bodilessness, ethereality, evanescence, flimsiness,
   ghostliness, immateriality, immaterialness, impalpability,
   imperceptibility, imponderability, incorporeality, incorporeity,
   inextension, insubstantiality, invisibility, mistiness,
   nonexteriority, occult phenomena, occultism, otherworldliness,
   psychical research, psychicism, psychics, psychism, shadowiness,
   spirit world, spirituality, spirituousness, subtility, subtlety,
   supernaturalism, tenuity, tenuousness, the occult, unconcreteness,
   unearthliness, unreality, unsolidity, unsubstantiality,
   unsubstantialness, unworldliness, vagueness