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.
(..) Interesting. What is? Well, your brother was a client with our London branch. We do a sort of informal scoring, and his numbers are outstanding. Really? Hmm. You sure you're not hungry? (..)1997 The Game