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.
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
So from a long time ago, every year 700,000 Mexicans have only three routes to take: migration, the informal economy and the path to antisocial behavior. Andres Manuel Lopez Obrador
During a large disaster, like Hurricane Katrina, warnings get hopelessly jumbled. The truth is that, for warnings to work, it's not enough for them to be delivered. They must also overcome that human tendency to pause; they must trigger a series of effective actions, mobilizing the informal networks that we depend on in a crisis. Gary Wolf
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
I love a modern suit paired with a polo or cotton T-shirt... and then paired with leather sneakers, or cashmere joggers with a tailored blazer and a sleeveless puffer vest to get the ultimate informal and formal combination. Brunello Cucinelli