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Definitions of insubstantial
  1. adjective
    lacking material form or substance; unreal
    "as insubstantial as a dream" "an insubstantial mirage on the horizon"
    Opposite:
  2. adjective
    lacking solidity or strength
    "vinyl siding has become the standard-bearer for cheap, insubstantial construction"

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  3. adjective
    lacking in nutritive value
    "an insubstantial and unsatisfying meal"

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