noun (n)

• intense aversion(noun.feeling)

  Synonym:
  horror, repulsion, revulsion
  

  source: wordnet30
• the relation between propositions that cannot both be true at the same time(noun.linkdef)

  Synonym:
  incompatibility, inconsistency, mutual exclusiveness
  

  source: wordnet30
• The state or condition of being repugnant; opposition; contrariety; especially, a strong instinctive antagonism; aversion; reluctance; unwillingness, as of mind, passions, principles, qualities, and the like.(noun)

  source: webster1913