The Collaborative International Dictionary of English v.0.48:

Disapproval \Dis`ap*prov"al\, n.
   Disapprobation; dislike; censure; adverse judgment.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disapproval
    n 1: a feeling of disliking something or what someone is doing
         [ant: approval]
    2: the expression of disapproval [ant: approval,
       commendation]
    3: an inclination to withhold approval from some person or group
       [syn: disfavor, disfavour, dislike, disapproval]
    4: the act of disapproving or condemning [ant: approval,
       approving, blessing]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "disapproval":
   abjuration, abjurement, aggravation, agreement to disagree,
   alienation, annoyance, apostasy, belittling, censure, chucking,
   chucking out, comedown, condemnation, contempt, contradiction,
   counter-culture, criticism, declination, declining, decrial,
   denial, depreciation, derogation, despisal, despising, detraction,
   difference, disaccord, disaffection, disaffinity, disagreement,
   disapprobation, discard, disclamation, discontent, discounting,
   discrediting, disfavor, disgrace, disinclination, dislike,
   dismissal, disownment, disparagement, disparity, displeasure,
   disregard, disrelish, dissatisfaction, dissension, dissent,
   dissentience, dissidence, distaste, diversity, dropping out,
   exasperation, exception, exclusion, faint praise, ignoring,
   indignity, irritation, knocking, lukewarm support, minimizing,
   minority opinion, nonacceptance, nonagreement, nonapproval,
   nonassent, nonconcurrence, nonconformity, nonconsent,
   nonconsideration, objection, opposition, passing by, putting away,
   putting down, putting out, rebuff, recantation, recusance,
   recusancy, refusal, rejection, renouncement, reproach, reproof,
   repudiation, repulse, resentfulness, resentment, scouting,
   secession, slighting, sour grapes, spurning, throwing out,
   turning out, underground, variance, vexation, withdrawal