excessively ambitious; having ambitions that are unrealistic or too high

अत्यधिक महत्वाकांक्षी

English Usage: His overambitious nature led him to take on more projects than he could handle.

Hindi Usage: उसकी अत्यधिक महत्वाकांक्षी स्वभाव ने उसे उतने प्रोजेक्ट लेने पर मजबूर किया जितने वह संभाल नहीं सका।