Explanation:

- Ambitious refers to someone who has a desire to achieve success or goals, often characterized by eagerness and determination.

- Option 1: Lazy means unwilling to work or use energy, lacking ambition.

- This is the opposite of ambitious as it signifies a lack of drive or desire to achieve.

- Option 2: Dynamic describes someone or something energetic, active, or forceful.

- Not an antonym but shares the energetic quality with ambitious.

- Option 3: Vigorous means strong, healthy, and full of energy.

- Not an opposite; it matches the energetic aspect of being ambitious.

- Option 4: Lively refers to being full of life and energy.

- Not an opposite; it is similar to being vibrant and active, aligning with ambitious qualities.