The antonyms for the word "most cathedral" are words that describe the opposite of a cathedral. Some possible antonyms include words like "humble," "unassuming," "modest," or "simple," which all suggest something that is small or unimpressive. Other antonyms might include words that describe things that are modern or industrial, such as "contemporary," "minimalist," or "utilitarian." Whatever the antonym, it is clear that it should be a word that represents the opposite of the grandeur and majesty that are typically associated with a cathedral. Whether you are looking to describe a building, a person, or an experience, finding the right antonym can help you paint a more complete picture.