The Collaborative International Dictionary of English v.0.48:

Superficiality \Su`per*fi`ci*al"i*ty\, n. [Cf. F.
   superficialit['e].]
   The quality or state of being superficial; also, that which
   is superficial. --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

superficiality
    n 1: lack of depth of knowledge or thought or feeling [syn:
         superficiality, shallowness] [ant: profoundness,
         profundity]
    2: shallowness in terms of affecting only surface layers of
       something; "he ignored the wound because of its
       superficiality"

Moby Thesaurus II by Grady Ward, 1.0:

167 Moby Thesaurus words for "superficiality":
   a little learning, absentmindedness, amateurism,
   apparent character, appearance, appearances, aridity, barrenness,
   big deal, bloodlessness, carelessness, characterlessness,
   colorlessness, cursoriness, deadness, dilettantism, dilettantship,
   dismalness, display, disregard, disregardfulness, distraction,
   dragginess, dreariness, dryness, dullness, dustiness, effeteness,
   emptiness, epidermis, etiolation, exteriority, exteriors,
   external appearance, externality, externalness, externals,
   extrinsicality, facade, flatness, flightiness, flimsiness,
   flippancy, fluffiness, foolishness, foreignness, frivolity,
   frivolousness, front, frothiness, futility, gaudiness, giddiness,
   glimmering, glimpse, gloss, half-learning, heaviness, heedlessness,
   hollowness, idleness, imperfect knowledge, inadvertence,
   inadvertency, inanity, inattention, inattentiveness,
   inconsideration, incuriosity, indifference, inexcitability,
   inobservance, insipidity, insipidness, jejunity, lack of depth,
   leadenness, levity, lifelessness, lightmindedness, lightness,
   lowness of spirit, manner, mere externals, mere scratch,
   meretriciousness, mien, negligence, no depth, no water,
   nonobservance, nugacity, obliviousness, openness, ostent,
   outerness, outward appearance, outward show, outwardness, paleness,
   pallor, pinprick, pointlessness, pokiness, ponderousness,
   public image, regardlessness, rind, sciolism, scratch, seeming,
   semi-learning, shallow-wittedness, shallowness, shoaliness, show,
   silliness, skin, slenderness, slight knowledge, slightness,
   slowness, smattering, smattering of ignorance,
   smattering of knowledge, solemnity, speciousness, spiritlessness,
   sterility, stiffness, stodginess, stuffiness, superficies, surface,
   surface appearance, surface show, surface-scratching,
   tastelessness, tediousness, thinness, thoughtlessness,
   triflingness, triteness, triviality, trivialness, unalertness,
   unawareness, unconsciousness, unheedfulness, unintentiveness,
   uninterestingness, unliveliness, unmindfulness, unobservance,
   unprofoundness, unprofundity, unwariness, unwatchfulness, vacuity,
   vague notion, vain show, vanity, vapidity, vapidness, veneer,
   volatility, woodenness