He took an 'informal' poll/survey among his coworkers.
She liked the easy/casual 'informality' of his manner.
He has an 'informal' manner that puts people at ease.
(..) We're not asking if you are, Lieutenant, and you're not required to respond even if asked. This is merely an informal inquiry. Where did you get these? The source of these photographs is also a part of our investigation. I see. They were (..)1997 G.I. Jane