noun (n)

• the quality of not being careful or taking pains(noun.attribute)

  Synonym:
  sloppiness
  Antonym:
  carefulness
  

  source: wordnet30
• failure to act with the prudence that a reasonable person would exercise under the same circumstances(noun.act)

  Synonym:
  neglect, negligence, nonperformance
  

  source: wordnet30
• The quality or state of being careless; heedlessness; negligence; inattention.(noun)

  source: webster1913