Antonyms of noun irresponsibility

1 sense of irresponsibility

Sense 1
irresponsibility, irresponsibleness -- (a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions)
       Antonym of responsibility (Sense 3)
      => responsibility, responsibleness -- (a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct; "he holds a position of great responsibility")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun irresponsibility

1 sense of irresponsibility

Sense 1
irresponsibility, irresponsibleness -- (a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions)
       => untrustworthiness, untrustiness -- (the trait of not deserving trust or confidence)