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.
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
Judging by informal observation, most young Americans burn up their spare time buffing their emotional IQ and self-esteem with social media and non-stop texting. That's great for eye-thumb coordination, but what about the satisfaction of actually making something? Seth Shostak
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
On many occasions, an informal buffet and casual seating offer a little more intimacy than a loud gathering around a big table. Yotam Ottolenghi
On the simplest level, telecommuting makes it harder for people to have the kinds of informal interactions that are crucial to the way knowledge moves through an organization. The role that hallway chat plays in driving new ideas has become a cliche of business writing, but that doesn't make it less true. James Surowiecki