noun (n)

• a belittling comment(noun.communication)

  Synonym:
  belittling
  

  source: wordnet30
• an abusive attack on a person's character or good name(noun.act)

  Synonym:
  aspersion, calumny, defamation, slander
  

  source: wordnet30
• the act of expressing disapproval (especially of yourself)(noun.act)

  Synonym:
  deprecation
  

  source: wordnet30
• The act of making black.(noun)

  source: webster1913