Final answer:
The failure to develop more purposeful, responsible, adult-like behaviors among adolescents results in Identity confusion, which is a weak sense of self and feeling confused about the future.
Step-by-step explanation:
In Erik Erikson's theory of psychosocial development, the failure to develop more purposeful, responsible, adult-like behaviors among adolescents results in Identity confusion, which is defined as a weak sense of self and feeling confused about the future. Adolescents who experience identity confusion are unsure of their identity and may struggle with questions like 'Who am I?' and 'What do I want to do with my life?'. This stage occurs when adolescents do not make a conscious search for identity or are pressured to conform to their parents' ideas for the future.