The antonyms for the phrase "becoming seasoned" could be "inexperienced," "unskilled," or "novice." These terms are used to describe someone who lacks knowledge or expertise in a particular field. They may struggle with the basics of their job or need to be closely supervised until they develop the necessary skills. Another antonym for "becoming seasoned" could be "immature," which refers to someone who has not yet fully developed the emotional or mental maturity to handle certain situations. Overall, the antonyms for "becoming seasoned" describe individuals who are still learning and growing in their field of work or personal development.