[{"role": "user", "content": "I want to understand how to express frustration with someone's behavior in Italian. How do I say 'You're immature' in Italian?"}, {"role": "assistant", "content": "To express frustration with someone's behavior in Italian, you can say 'Siete immaturi.' This translates to 'You're immature' in English. However, please note that'siete' is a formal you, if you want to say it to a friend or someone you know you can say 'Sei immaturo' for a male and 'Sei immatura' for a female."}]