The antonyms for the phrase "am convinced of" are doubting, unsure, and skeptical. When one is doubtful, they are uncertain about the veracity or correctness of a particular statement or opinion. Being unsure implies a lack of confidence or conviction in one's beliefs or ideas. Lastly, being skeptical means having a guarded, questioning attitude regarding a particular notion or belief. Opposing these antonyms are terms that describe the state of being certain, such as persuaded, confident, and assured. Overall, antonyms are important in expanding our vocabulary and understanding the multiple ways words can be used to express meaning.