Source : Webster's Revised Unabridged Dictionary (1913)

Dissatisfaction \Dis*sat`is*fac"tion\, n.
   The state of being dissatisfied, unsatisfied, or
   discontented; uneasiness proceeding from the want of
   gratification, or from disappointed wishes and expectations.

         The ambitious man has little happiness, but is subject
         to much uneasiness and dissatisfaction.  --Addison.

   Syn: Discontent; discontentment; displeasure; disapprobation;
        distaste; dislike.

Source : WordNet®

dissatisfaction
     n : the feeling of being displeased and discontent; "he was
         never slow to express his dissatisfaction with the
         service he received" [ant: {satisfaction}]