The antonyms for the phrase "filled one position" include words like vacant, unfilled, unoccupied, empty, and available. These words are used to describe a situation where a designated spot or role is not currently occupied or engaged. For instance, an organization may have an empty position for a certain job, which requires skilled personnel to fill the post. Similarly, a company may have an available position that has just opened up, which they are in the lookout for candidates to fill. Thus, understanding these antonyms can be useful for job seekers, organizations, and businesses to communicate the status of their role or vacancy to others effectively.