The quality of not being reliable or trustworthy, and not taking one's duties or the consequences of one's actions seriously.
From 'irresponsible,' combining the prefix 'ir-' (not) with 'responsible' (from Latin 'respondere' meaning 'to answer or respond'), forming the opposite concept.
Irresponsibility isn't just a moral failing—developmental psychologists track that the brain's responsibility-judgment centers don't fully develop until the mid-20s, which is why teenagers are biologically more irresponsible.
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