Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writting, proceeding, or visit.
The story about GE that hasn't been told is the value of an informal place. I think it's a big thought. I don't think people have ever figured out that being informal is a big deal. Jack Welch
We must ensure that while eliminating child labor in the export industry, we are also eliminating their labour from the informal sector, which is more invisible to public scrutiny - and thus leaves the children more open to abuse and exploitation. Carol Bellamy
My grandmother was a kind of Scarsdale, New York, society woman, best known in her day as the author of the 1959 book 'Growing Your Own Way: An Informal Guide for Teen-Agers' - this despite being a person whose parenting style made Joan Crawford's wire hangers look like pool noodles. Sloane Crosley
When I took part in European leaders summits, it was sometimes unpleasant for me to hear Romanian, Polish, Portuguese, and Italian friends speak English, although I admit that on an informal basis, first contacts can be made in this language. Nevertheless, I will defend everywhere the use of the French language. Francois Hollande
I would have strong opinions and be prepared to argue my case, but if you talk to my colleagues, I think you'd find they consider me the jokester, the informal mayor of the West Wing. Karl Rove