irresponsible: Meaning and Definition of

ir•re•spon•si•ble

1. said, done, or characterized by a lack of a sense of responsibility: His refusal to work shows him to be completely irresponsible.
2. not capable of or qualified for responsibility, as due to age, circumstances, or a mental deficiency.
3. not responsible, answerable, or accountable to higher authority: irresponsible as a monarch.

1. an irresponsible person.