rookie

This term carries a strong association with sports and law enforcement, where it specifically denotes a first-year professional. While it can be used neutrally to describe a newcomer, it often implies a lack of seasoned judgment or a vulnerability to simple errors. When used as an adjective, it typically describes a specific type of failure—the rookie mistake—which is an error that an experienced person would instinctively avoid. This usage emphasizes the gap between theoretical knowledge and practical, on-the-job experience.