insubstantiality

insubstantiality
    n 1: lack of solid substance and strength
    2: lacking substance or reality [ant: {solidness},
       {substantiality}, {substantialness}]
    

Insubstantiality \In`sub*stan`ti*al"i*ty\, n.
   Unsubstantiality; unreality. [R.]
   [1913 Webster]
    

77 Moby Thesaurus words for "insubstantiality":
      airiness, airy nothing, airy texture, attenuation, bodilessness,
      danger, delicacy, desultoriness, diaphanousness, dilutedness,
      dilution, ethereality, exiguity, exility, fineness, flimsiness,
      frailty, gauziness, gossameriness, gracility, hazard,
      immateriality, impalpability, imponderability, incorporeality,
      infirmity, insecurity, insolidity, instability, intangibility,
      laciness, lightness, mistiness, paperiness, peril, perilousness,
      precariousness, rareness, rarity, risk, riskiness, shakiness,
      shiftiness, shiftingness, slenderness, slightness, slimness,
      slipperiness, speculativeness, subtility, subtilty, subtlety,
      tenuity, tenuousness, thinness, ticklishness, treacherousness,
      treachery, unauthenticity, unauthoritativeness, unconcreteness,
      undependability, unfaithworthiness, unreality, unreliability,
      unsolidity, unsoundness, unsteadfastness, unsteadiness,
      unsubstantiality, unsubstantialness, unsureness, untrustworthiness,
      vagueness, wateriness, weakness, wispiness