noun (n)

• the quality of being unfaithful

  kualitas setia

  Synonym:
  unfaithfulness
  Antonym:
  faithfulness, fidelity
  

  source: wordnet30
• Want of faith or belief in some religious system; especially, a want of faith in, or disbelief of, the inspiration of the Scriptures, of the divine origin of Christianity.

  ingin kepercayaan agama atau kepercayaan dalam beberapa sistem; khususnya, ingin iman dalam, atau dari ketidakpercayaan, inspirasi kitab suci, bagi kumpulan asal dari kekristenan.

  source: webster1913