Wise Vocabulary: Related words and phrases Physically and mentally mature & immature Grownup adulting getting old babyish childish immature immaturely immaturity infantile juvenile maturity overgrown petulance petulancy petulant petulantly puerility secondary sexual characteristic sophomoric young at heart idiom See extra final results » Onze redactie maakt al jaren uitleg­online vide... https://mature52.com