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Adjective: insubstantial  ,in-sub'stan-shul
  1. Lacking material form or substance; unreal
    "an insubstantial mirage on the horizon"; "as insubstantial as a dream";
    - unsubstantial, unreal
     
  2. Lacking in nutritive value
    "the insubstantial diets of the very poor";
    - jejune

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

Antonym: substantial