noun (n)

• an improper demeanor(noun.attribute)

  Synonym:
  improperness
  Antonym:
  correctitude, properness, propriety
  

  source: wordnet30
• the condition of being improper(noun.state)

  source: wordnet30
• an indecent or improper act(noun.act)

  Synonym:
  indecency
  

  source: wordnet30
• an act of undue intimacy(noun.act)

  Synonym:
  familiarity, indecorum, liberty
  

  source: wordnet30
• The quality of being improper; unfitness or unsuitableness to character, time place, or circumstances; as, impropriety of behavior or manners.(noun)

  source: webster1913