Preparation is the key to success, and being unprepared can lead to disaster. Luckily, there are many antonyms for unprepared that can help you avoid this situation. Prepared, equipped, ready, planned, organized, and prepped are all excellent antonyms for unprepared. These words not only convey a sense of being ready, they also suggest that you have considered all the variables and made a plan to handle any contingencies. So if you want to avoid being caught off guard, be sure to use these antonyms to describe yourself or others who are well-prepared for whatever life may throw their way.