WordNet (3.0) 
(n) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actionsSyn. irresponsiblenessAnt. responsibility, responsibleness
  Collaborative International Dictionary (GCIDE) 

n. [ Cf. F. irresponsabilité. ] 1. Lack of, or freedom from, responsibility or accountability. [ 1913 Webster ]

2. A trait causing one to act without a proper sense of responsibility; acting without giving proper weight to one's responsibilities. [ PJC ]

  EDICT JP-EN Dictionary 
[むせきにん, musekinin] (adj-na, n) irresponsibility; (P) #15747
[さんむしゅぎ, sanmushugi] (n) the "three noes principle" of no drive (indolence), no interest (indifference), and no sense of responsibility (irresponsibility), the term describing the temperament of the Japanese youth of the 1970s
  DING DE-EN Dictionary 
Unverantwortlichkeit { f }; Verantwortungslosigkeit { f }
irresponsibility
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