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Adjective: insubstantial  ,in-sub'stan-shul
  1. Lacking in nutritive value
    "an insubstantial and unsatisfying meal"
  2. Lacking solidity or strength
    "vinyl siding has become the standard-bearer for cheap, insubstantial construction";
    - flimsy
  3. Lacking material form or substance; unreal
    "an insubstantial mirage on the horizon"; "as insubstantial as a dream";
    - unsubstantial, unreal

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