1
as in spiritual
not composed of matter
as thin and unsubstantial as the wind
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2
as in insubstantial
being of a material lacking in sturdiness or substance
unsubstantial wisps of lace
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3
as in weak
lacking bodily strength
an unsubstantial child who was unfit to play sports of any kind
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Merriam-Webster unabridged
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