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Adjective: unsubstantial  ,ún-sub'stan-shul
  1. Lacking material form or substance; unreal
    "as unsubstantial as a dream";
    - insubstantial, unreal

See also: aerial, aeriform, aery, airy, ethereal, immaterial, nonmaterial, shadowy, solidness, stringy, substantiality, substantialness, wraithlike