[n] lacking substance or reality [n] lack of solid substance and strength
substantiality, substantialness
airiness, airy nothing, airy texture, attenuation, bodilessness, danger, delicacy, desultoriness, diaphanousness, dilutedness, dilution, ethereality, exiguity, exility, fineness, flimsiness, frailty, gauziness, gossameriness, gracility, hazard, immaterial