noun
the quality of being insubstantial; lack of substance or solidity
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The insubstantiality of the evidence presented led to the case being dismissed.
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I can't believe the insubstantiality of his excuse for being late.
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Her argument had so much insubstantiality, it was like she was talking nonsense.
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The insubstantiality of his promises left her feeling uncertain about their future.