The phrase "am sold for" means that someone has been convinced or swayed by an idea or product. It can be used to express a positive sentiment, such as being sold on a new gadget, or a negative one, like feeling helpless and being "sold" to an unethical organization. The antonyms of "am sold for" are "skeptical," "doubtful," "unsure," and "unconvinced." People who are skeptical are cautious and skeptical of new ideas, products or people. Doubtful and unsure are terms used to describe people who are not confident or have reservations. Being unconvinced implies that ideas or arguments have not been convincing enough to persuade someone.