Being confident about something is a feeling that makes you feel strong and empowered. But sometimes, we use the same phrase repeatedly in our writing or speech, which can make it sound repetitive and dull. To avoid that, we can use different synonyms for the phrase 'be confident of.' Some of the synonyms that convey the same meaning are - trust, have faith in, rely on, count on, have no doubt, assured, secure, convinced, convinced of, persuaded, and believe in. By using these synonyms, we can add variety to our writing and make it more impactful. So, the next time you want to express confidence, try using some of these alternatives to keep your language interesting and engaging.