So would "jesteś pijany" or "czy jesteś pijany" be more suitable to use with friends as opposed to adults or strangers?
Ok, listen. To make it easy for you:
1. If you have a statement (not a question) never
2. If you have a yes or no
-question, always begin with 'czy'.
If you follow these 2 simple rules it will be correct, and you don't have to involve formal/informal considerations.There are other possible options as well, but don't make it more difficult than it is.
Yes, that was the noun I was looking for.