An informal tone is when you speak to someone, like a friend, when having a normal everyday conversation with them. You are speaking to them in a friendly manner.
A friendly and respectfully tone.
To create a friendly tone
in a civil manner in a friendly manner with a friendly tone
To appear likeable
A speaker with a distinctive way of talking
Tone means something that the author uses in a book.
You can politely ask them to be quiet in a friendly tone.
Tone isn't something with one right answer - it's based on how the writer makes you feel. This sentence makes you think the writer is looking forward to seeing the person, so it could be called a friendly tone or an excited tone or even an anticipatory tone.
Friendly: Apex
Lawyers aren't interested in friendly; they are interested in accurate, and at least in documents, neutral.
Sure you do not mean 420 friendly?