Antonyms for the term "firming deal" can range from words that indicate a lack of agreement or commitment, such as "dispute", "deny", or "cancel", to adjectives that describe deals that are uncertain or unstable, such as "flimsy", "shaky", or "unreliable". Another category of antonyms could include words like "unprofitable", "inefficient", or "ineffective", which describe deals that are unlikely to create long-term benefits or value for all parties involved. In contrast to the concept of a firming deal, these words suggest an inability to reach an agreement or to create a solid foundation for cooperation and growth.