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1. Lacking material substance; insubstantial.
2. Lacking firmness or strength; flimsy.
3. Lacking basis in fact.

un′sub·stan′ti·al′i·ty (-shē-ăl′ĭ-tē) n.
un′sub·stan′tial·ly adv.
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References in classic literature ?
Fairfax's warnings, and the damp of her doubts were upon me: something of unsubstantiality and uncertainty had beset my hopes.
The Unsubstantiality of Aesthetics" from "Preface" to Life and Letters, trans.