Source : Webster's Revised Unabridged Dictionary (1913)

Intangible \In*tan"gi*ble\, a. [Pref. in- not + tangible: cf. F.
   intangible.]
   Not tangible; incapable of being touched; not perceptible to
   the touch; impalpable; imperceptible. --Bp. Wilkins.

         A corporation is an artificial, invisible, intangible
         being.                                   --Marshall.
   -- {In*tan"gi*ble*ness}, n. -- {In*tan"gi*bly}, adv.

Source : WordNet®

intangibleness
     n : the quality of being intangible [syn: {intangibility}, {impalpability}]
         [ant: {tangibility}, {tangibility}]