The term "clinched deal" is commonly used to describe a successful negotiation or agreement reached between two parties. However, there are several antonyms for this phrase that indicate an unsuccessful negotiation or an agreement that falls through. Some of these antonyms include "unfinished business," "open question," "loose ends," "debate," "impasse," and "unresolved." These words describe situations where negotiations have stalled or simply failed to yield the desired outcome. While these may not be the desired results, they serve as a reminder to approach negotiations with caution and to always be prepared for various outcomes.