Source : Webster's Revised Unabridged Dictionary (1913)

Discontentment \Dis`con*tent"ment\, n.
   The state of being discontented; uneasiness; inquietude.
   --Bacon.

Source : WordNet®

discontentment
     n : a longing for something better than the present situation
         [syn: {discontent}, {discontentedness}] [ant: {contentment}]