Fixed purpose means having a definite goal or aim that is unwavering. Synonyms for fixed purpose include determination, drive, resolve, willpower, tenacity, steadfastness, perseverance, persistence, grit, and single-mindedness. These words carry a sense of unwavering commitment and the ability to stay focused on a particular task or objective despite obstacles and challenges. A person with a fixed purpose is unshakable in their resolve and is determined to see the task to completion, no matter what. Whatever word we use, having a fixed purpose is an essential quality for achieving success in any area of life.