The antonyms for "makes fast" could include words like "loosens," "unbinds," "disconnects," "unties," "disentangles," and "separates." These words imply opposite actions to the phrase "makes fast," which suggests binding or tying something together securely. "Loosens" and "unbinds" suggest freeing or releasing something from its position, while "unties" and "disentangles" indicate separating or disentangling materials or objects from one another. "Disconnects" suggests the breaking of a connection or link, whereas "separates" implies the moving apart of two or more things. These antonyms highlight the diversity of language and the necessity of choosing an appropriate word to convey the intended meaning.