The Collaborative International Dictionary of English v.0.48:

Smugness \Smug"ness\, n.
   The quality or state of being smug.
   [1913 Webster]

WordNet (r) 3.0 (2006):

smugness
    n 1: an excessive feeling of self-satisfaction

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "smugness":
   Quakerishness, amour-propre, autoeroticism, blandness, bovinity,
   butter, censoriousness, complacence, complacency, consequentiality,
   demureness, demurity, ego trip, fair words, false modesty,
   fulsomeness, glibness, hideboundness, honeyed words, incense,
   mauvaise honte, narcism, narcissism, narrowness, oiliness,
   overmodesty, overproudness, overweening pride, priggishness,
   primness, prudery, prudishness, puritanicalness, sanctimoniousness,
   sanctimony, self-admiration, self-approbation, self-complacency,
   self-congratulation, self-content, self-contentedness,
   self-delight, self-endearment, self-esteem, self-gratulation,
   self-importance, self-infatuation, self-love, self-respect,
   self-satisfaction, self-sufficiency, self-worship, smoothness,
   soft soap, soft words, stiff-neckedness, straitlacedness,
   stuffiness, suaveness, suavity, sweet talk, sweet words,
   unctuousness, vaingloriousness, vainglory, vainness, vanity