The phrase "made fast" can have multiple meanings depending on the context. It could mean secured firmly, tightened, or even established in a particular position. The antonyms for "made fast" could include words like "loosened," "unfastened," "unsecured," "unbolted," or "unsettled." For instance, if something was made fast to a surface, its antonym would be "unbolted" or "unsecured" due to the removal of its secure attachment. In short, the antonyms for "made fast" would be words that signify the opposite of being secure, firm, or established, but rather convey meanings of loosening, separating, or detaching.