When someone is convinced of something, there are a number of alternative ways to express that same sentiment. For example, one might say they are certain, confident, or persuaded. Other synonyms include being satisfied, sure, convinced, or certain. A person might also express the concept of being convinced by saying they have made up their mind or that they are resolute in their beliefs. Beyond just synonyms for the word 'convinced', there are also numerous expressions and idioms that convey this same sense of conviction, such as being sold on an idea or being wholly committed to something. Ultimately, the ways in which people express their conviction are as varied as the individuals themselves.