The term 'coming agreement' can be substituted by its antonym, which is 'dissension' or 'disagreement.' The word dissension refers to a lack of agreement or consensus among individuals, groups, or countries. It can occur due to different points of view or interests conflicting with one another. Dissension can often lead to arguments, disputes, and even wars. Conversely, agreement is a state of consensus between two or more parties, which can lead to cooperation and harmony. In conclusion, the antonym of 'coming agreement' is 'dissension,' and the opposite indicates the lack of unity, understanding, and cooperation.