The word "un-ambitious" is used to describe someone who lacks drive and determination. Its antonyms, on the other hand, represent qualities such as motivation, aspiration, and ambition. Words like "ambitious," "driven," "determined," "motivated," "goal-oriented," "ambitious," "aspirational," and "ardent" all convey a strong desire to succeed and achieve. These words paint a picture of someone who is willing to put in the hard work and effort necessary to achieve their goals, and who is not content with settling for less. Ultimately, the antonyms of "un-ambitious" represent the qualities that are essential for success in any field of endeavor.