"Determined" is an adjective that describes someone who is resolute, having made up one's mind to achieve something, and who is not easily discouraged. It often implies a strong will and a focus on reaching a goal or completing a task. Here are a few examples of how "determined" might be used in a sentence:
She was determined to succeed in her new job.
Despite the challenges, he remained determined to finish the marathon.
The determined effort of the team led to a victory in the final minutes of the game.