noun (n)

• a behavioral attribute that is distinctive and peculiar to an individual(noun.attribute)

  Synonym:
  foible, idiosyncrasy
  

  source: wordnet30
• a deliberate pretense or exaggerated display(noun.act)

  Synonym:
  affectation, affectedness, pose
  

  source: wordnet30
• Adherence to a peculiar style or manner; a characteristic mode of action, bearing, or treatment, carried to excess, especially in literature or art.(noun)

  source: webster1913