When you're not confident of something, you may feel uncertain, doubtful, or insecure. Antonyms of being confident of include being unsure, hesitant, timid, and uneasy. Being unconfident can restrict you from taking risks, trying new things, and achieving your goals. It's important to acknowledge your fears and insecurities, but it's equally important to move past them and push yourself out of your comfort zone. Working on building up your confidence through positive self-talk, seeking support from trusted friends or family members, and practicing self-care can all help you feel more confident in your abilities and decisions.