noun (n)

• failure to act with the prudence that a reasonable person would exercise under the same circumstances(noun.act)

  Synonym:
  carelessness, neglect, nonperformance
  

  source: wordnet30
• the trait of neglecting responsibilities and lacking concern(noun.attribute)

  Synonym:
  neglect, neglectfulness
  

  source: wordnet30
• The quality or state of being negligent; lack of due diligence or care; omission of duty; habitual neglect; heedlessness.(noun)

  source: webster1913