The phrase "is determined" implies a sense of strong will and commitment towards achieving a specific goal. Some synonyms that can replace this phrase include "is resolved," "is dedicated," "is driven," "is adamant," and "is unwavering." These phrases convey a sense of tenacity and perseverance, highlighting the steadfast nature of an individual's determination. Other synonyms that can be used to describe this trait include "is persistent," "is resolute," "is steadfast," "is unyielding," and "is unrelenting." All of these words paint a picture of someone who is determined to achieve their goals and overcome any obstacles in their path.