Impalpable /(?)/

Im·pal·pa·ble

Impalpable

a.
  1. Not palpable; that cannot be felt; extremely fine, so that no grit can be perceived by touch.
  2. Not material; intangible; incorporeal.
  3. Not apprehensible, or readily apprehensible, by the mind; unreal; as, impalpable distinctions.