The antonyms for the phrase "more prepped" are those that relate to being less prepared or unprepared. Some suitable antonyms for the term could be unprepared, unready, doubtful, uncertain, inexperienced, and ill-equipped. While being prepped implies having made arrangements, being ready, having taken the necessary steps, and having all the equipment needed for a particular task, being unprepared means not having done any of these things. It can be quite challenging to perform any task successfully without proper preparation. If you are not more prepped, it is advisable to avoid taking up any task until you are better prepared.