#immaturity

• Adolescentism — An attitude, behavior, or mindset specific to adolescents, characterized by immaturity, impulsivity, naive idealism, attention-seeking defiance, or emotional instability; a manifestation of a rebellious or nonconformist spirit sometimes prolonged beyond the natural limits of youth. Critically, the term describes a structural refusal to assume adult responsibilities.
• Adolescentism — A variant or synonym for adolescentinism; a collection of behavioral characteristics, affective states, and thinking patterns specific to the age of adolescence; a tendency to prolong juvenile manifestations into adult behavior. In linguistics, it can denote the excessive use of youth jargon or slang in standard public discourse.