noun (n)

• act of failing to meet a financial obligation(noun.possession)

  Synonym:
  default, nonremittal
  

  source: wordnet30
• loss resulting from failure of a debt to be paid(noun.possession)

  Antonym:
  payment
  

  source: wordnet30
• the deliberate act of failing to pay money(noun.act)

  Example:
  He was indicted for nonpayment.
  

  Synonym:
  evasion
  Antonym:
  defrayal, defrayment, payment
  

  source: wordnet30
• Neglect or failure to pay.(noun)

  source: webster1913