The Collaborative International Dictionary of English v.0.48:

Disaffection \Dis`af*fec"tion\, n.
   1. State of being disaffected; alienation or want of
      affection or good will, esp. toward those in authority;
      unfriendliness; dislike.
      [1913 Webster]

            In the making laws, princes must have regard to . .
            . the affections and disaffections of the people.
                                                  --Jer. Taylor.
      [1913 Webster]

   2. Disorder; bad constitution. [R.] --Wiseman.

   Syn: Dislike; disgust; discontent; unfriendliness;
        alienation; disloyalty; hostility.
        [1913 Webster]

WordNet (r) 3.0 (2006):

disaffection
    n 1: the feeling of being alienated from other people [syn:
         alienation, disaffection, estrangement]
    2: disloyalty to the government or to established authority;
       "the widespread disaffection of the troops"

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "disaffection":
   Punic faith, alienation, bad faith, barratry, breach,
   breach of faith, breach of friendship, breach of promise,
   breach of trust, break, cleavage, cleft, dereliction, disaffinity,
   disapprobation, disapproval, disfavor, disinclination, dislike,
   disloyalty, displeasure, disrelish, disruption, distaste, disunion,
   disunity, divergence, dividedness, division, estrangement,
   faithlessness, falling-out, falseness, falsity, fickleness,
   inconstancy, infidelity, mala fides, open rupture,
   recall of ambassadors, recreancy, rift, rupture, schism,
   separation, split, trothlessness, unfaith, unfaithfulness,
   unloyalty, unsteadfastness, untrueness