irresponsibility

/ˌɪrɪˌspɑnsəˈbɪləti/
noun
  1. The quality or state of not being reliable or accountable for one's actions or duties.
    • The company's irresponsibility led to a major environmental disaster.
    • His constant lateness showed a complete irresponsibility toward his job.
    • She finally ended the friendship because of his financial irresponsibility.