Insubstantial is an adjective that means lacking form, substance or nutritional value. If you're really hungry, a bowl of clear broth will seem pretty insubstantial.

If there is insubstantial evidence to convict an accused criminal, he will be set free. In the office, insubstantial expenses should be paid out of the petty cash draw. A thin blouse is too insubstantial to be worn in this cold weather. And a candy bar makes an insubstantial lunch — a sandwich and fruit would be more nutritious.

Definitions of insubstantial
  1. adjective
    lacking material form or substance; unreal
    “as insubstantial as a dream”
    “an insubstantial mirage on the horizon”
    synonyms: unreal, unsubstantial
    aerial, aeriform, aery, airy, ethereal
    characterized by lightness and insubstantiality; as impalpable or intangible as air
    shadowy, wraithlike
    lacking in substance
    consisting of or containing string or strings
    immaterial, nonmaterial
    not consisting of matter
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    material, real, substantial
    having substance or capable of being treated as fact; not imaginary
    derived from or composed of matter
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  2. adjective
    lacking in nutritive value
    synonyms: jejune
    detrimental to physical or moral well-being
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