The characters combine to form a vivid metaphor. `世面 (shìmiàn)` means “the face of the world” – a set phrase for worldly experience, exposure, and the complexities of society. Therefore, `没见过世面 (méi jiàn guò shì miàn)` literally means “have not seen the face of the world.”
In Chinese culture, having broad experience and exposure (`见世面`) is highly valued. It signifies maturity, social grace, and the ability to navigate complex situations with composure. A person who has “seen the world” is respected for their broad perspective and calm demeanor. Consequently, being `没见过世面` is seen as a deficiency. It implies a certain naivety that can be a liability in social and professional settings. Parents often express a desire for their children to travel, study abroad, or simply experience more of life precisely so they won't be `没见过世面`. This concept differs slightly from the Western idea of a “country bumpkin” or being “sheltered.” While those terms often carry connotations of class or rural origin, `没见过世面` is more about the *scope of one's experience*. A wealthy individual who has never ventured outside their privileged bubble could just as easily be described as `没见过世面` as someone from a remote village. It's a judgment on one's lack of exposure to the diversity of life, not just one's socioeconomic background.
The connotation of this phrase depends heavily on tone and context.