Having conviction is a feeling of determination and confidence in one's beliefs and principles. Synonyms for having conviction include being resolute, determined, unyielding, steadfast, and strong-willed. When someone is resolute, they are not easily swayed from their beliefs and will stick to their principles, even in the face of opposition. Determined individuals have a firm resolve and will take steps to achieve their goals. Unyielding people refuse to compromise on their beliefs, even under pressure. Strong-willed individuals have an unshakeable determination to see things through. Finally, steadfast individuals are unwavering, holding true to their beliefs even during difficult times.