The phrase "is ambitious" is commonly used to describe an individual who is motivated and driven to achieve their goals and aspirations. However, there are several synonyms that can be used interchangeably depending on the context and tone. Some examples of synonyms for "is ambitious" include: has big dreams, is goal-oriented, is driven, is determined, aspires to greatness, strives for success, is motivated, is hardworking, is passionate, and has a strong work ethic. Each of these synonyms conveys a slightly different connotation which can enhance or change the overall meaning of the original phrase.