When combined, `不切实际` literally means “not cutting close to the actual situation.” The idea fails to “fit” or “match” reality. It's a wonderfully visual and intuitive way to express the concept of being impractical.
The term `不切实际` taps directly into the deep-seated cultural value of pragmatism (务实, wùshí) in Chinese society. While Western cultures, particularly American culture, often celebrate “shooting for the moon” and “dreaming big,” Chinese culture traditionally places a much stronger emphasis on being 脚踏实地 (jiǎo tà shí dì)—having one's feet planted firmly on the ground. An American might hear a “pie-in-the-sky” idea and think, “It's a long shot, but it's ambitious!” A more traditional Chinese perspective might immediately label it `不切实际` and view it with skepticism. This isn't necessarily pessimism; rather, it's a preference for plans that are feasible, stable, and well-considered. To call someone's idea `不切实际` is a serious critique, suggesting they haven't properly assessed the reality of the situation. It implies a lack of maturity, experience, or sound judgment.
`不切实际` is a common and versatile term used across many contexts, almost always with a negative or cautionary connotation.
It is used in both formal writing and everyday conversation. It can directly modify a noun (e.g., `不切实际的想法` - an unrealistic idea) or function as a predicate (e.g., `这个计划太不切实际了` - this plan is too unrealistic).