Synonyms and related words :
airiness, animation, ascent, brainlessness, bubbliness, buoyancy, caducity, changeability, changeableness, coquettishness, corruptibility, daintiness, death, delicacy, downiness, empty-headedness, ephemerality, ephemeralness, ethereality, evanescence, evaporability, faddishness, faddism, fickleness, finitude, fleetingness, flightiness, flippancy, floatability, fluffiness, foaminess, foolishness, frivolity, frivolousness, frothiness, fugacity, gentleness, giddiness, gossameriness, impermanence, impermanency, inconstancy, instability, lack of depth, lack of weight, levitation, levity, lightness, mercuriality, mercurialness, momentariness, mortality, mutability, perishability, shallow-wittedness, shallowness, skittishness, softness, sprightliness, superficiality, tenderness, thinness, thoughtlessness, transience, transiency, transientness, transitoriness, undependability, unheaviness, unpredictability, unprofoundness, unprofundity, unreliability, vaporability, vaporizability, variability, weightlessness, witlessness, yeastiness