1. having a strong desire to succeed or achieve something important
2. requiring great effort, skill, or resources to accomplish

Examples

• She is an ambitious student who wants to become a doctor.
• The company has ambitious plans to expand internationally.
• His ambitious goal is to climb Mount Everest next year.
• The ambitious project will take five years to complete.
• Young entrepreneurs are often very ambitious about their startups.
• The film director’s ambitious vision required a huge budget.
• It was an ambitious attempt to solve the city’s traffic problems.