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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 fundamental thesis of deconstructivism is based upon unravelling the word (and language in general), upon stripping it from the conventions and ideologies that construct a certain meaning, simultaneously identifying the multitude of novel possible meanings, hidden behind the apparent, but subject, in their turn, to unsubstantiality, contradiction and relativity.
The Unsubstantiality of Aesthetics" from "Preface" to Life and Letters, trans.