The term "in fix" is commonly used to express that someone is in trouble or facing a difficult situation. However, there are several words that can be used as antonyms to describe the opposite of being in fix. A few examples are "problem-free," "untroubled," and "easy-going." These words suggest a situation where there are no problems or obstacles, and everything is going smoothly. Another opposite of "in fix" is "secure," which means to have a sense of safety and stability. So, if you want to express the opposite of being in a difficult situation, you can use any of these words or phrases to convey a sense of ease, comfort, and safety.