noun (n)

• inappropriate playfulness(noun.attribute)

  Synonym:
  archness, impertinence, perkiness, sauciness
  

  source: wordnet30
• quality of being lively and confident(noun.attribute)

  Example:
  There was a pertness about her that attracted him.
  

  source: wordnet30
• The quality or state of being pert.(noun)

  source: webster1913