The antonyms for the phrase "more set up" are "less established", "undeveloped", "unprepared", "improvised", and "disorganized". When something is "less established," it means that it is not yet fully established or well-developed. "Undeveloped" refers to something that has not yet been fully developed or made ready. "Unprepared" means that someone or something is not ready for a particular task or situation. "Improvised" refers to a situation where something is created with what is available at the moment without proper planning or preparation. Lastly, "disorganized" means that something is not structured or arranged in an orderly manner.