The Collaborative International Dictionary of English v.0.48:

Discontented \Dis`con*tent"ed\, p. p. & a.
   Dissatisfied; uneasy in mind; malcontent.
   [1913 Webster]

         And every one that was in distress, and every one that
         was in debt, and every one that was discontented,
         gathered themselves unto him.            --1 Sam. xxii.
                                                  2.
   -- Dis`con*tent"ed*ly, adv. -- Dis`con*tent"ed*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

discontentedness
    n 1: a longing for something better than the present situation
         [syn: discontentment, discontent, discontentedness]
         [ant: contentment]