I think the word "mad" is too casual and informal. Could you please tell me some alternative words that can replace it?
Native speaker’s answer
Rebecca
"Mad" is not necessarily informal, it just depends on the context in which you use it. In this context, it is appropriate to use, however if you wanted the sentence to sound a bit more formal, you could replace "mad" with "angry", "upset", "irritated", or "displeased". There are many other synonyms for "mad", however most express a much more extreme meaning of anger. Ex: I'm irritated with him because he lied to me. Ex: She's upset with her roommate for making a mess.