The antonyms for "becomes experienced" are "novice," "rookie," "amateur," "fledgling," "greenhorn," "ignorant," and "unfamiliar." These words suggest a lack of knowledge, skill, or expertise in a particular field that stands in contrast to someone who is experienced. A novice, for instance, lacks the experience and knowledge to perform a task with expertise. In contrast, an experienced person is well-equipped to navigate a situation with ease, having gained the knowledge and skills over time. Therefore, these antonyms provide insight into the different levels of knowledge, skill, and experience that a person can possess in any given field.