irresponsibility
  無責任
  ir·re·spon·si·bil·i·ty /-ˌspɑn(t)səˈbɪlətɪ/ 名詞
  Ir·re·spon·si·bil·i·ty n.
  1. Lack of, or freedom from, responsibility or accountability.
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  irresponsibility
       n : a form of untrustworthiness; the trait of lacking a sense of
           responsibility and not feeling accountable for your
           actions [syn: irresponsibleness] [ant: responsibility,
            responsibility]