[{"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 'Lei \u00e8 immatura.' This directly translates to 'You're immature.' Keep in mind that this phrase is formal, if you want to use the informal version you can say 'Tu sei immaturo' (male) or 'Tu sei immatura' (female) to a friend or someone you're familiar with."}]