The word "cincher" has a few possible antonyms depending on which meaning of the word is being considered. In the context of an article of clothing designed to tightly cinch the waist, an antonym might include "loose-fitting," "relaxed," or "unrestricted." For the verb form of "cincher," meaning to secure or clinch a deal or victory, antonyms might include "lose," "fall short," "abandon," or "withdraw." In either case, the antonym of "cincher" implies the opposite of its intended action, providing a contrasting notion of either a lack of restraint or a failed attempt.