noun (n)

• the quality of being facile in speech and writing

  kualiti menjadi lancar dalam ucapan dan menulis

  Synonym:
  articulateness, fluency
  

  source: wordnet30
• The quality or state of being voluble (in any of the senses of the adjective).

  kualiti atau keadaan menjadi petah (di setiap indera dari sifat) .

  source: webster1913