The phrase "were ambitious" can be replaced with various synonyms, such as driven, motivated, aspiring, determined, or goal-oriented. These words all convey the idea that someone has a strong desire to succeed or achieve something. "Ambitious," however, often has a negative connotation, implying that someone is ruthless or willing to do whatever it takes to get ahead. Other synonyms for "were ambitious" that carry a less negative connotation include enthusiastic, eager, or passionate. These words suggest a strong desire for success without the implications of ruthlessness or greed. Ultimately, the synonym used will depend on the desired tone and context of the sentence.