noun (n)

• a cruel act; a deliberate infliction of pain and suffering(noun.act)

  Synonym:
  inhuman treatment
  

  source: wordnet30
• feelings of extreme heartlessness(noun.feeling)

  Synonym:
  mercilessness, pitilessness, ruthlessness
  

  source: wordnet30
• the quality of being cruel and causing tension or annoyance(noun.attribute)

  Synonym:
  cruelness, harshness
  

  source: wordnet30
• The attribute or quality of being cruel; a disposition to give unnecessary pain or suffering to others; inhumanity; barbarity.(noun)

  source: webster1913