There are various antonyms for the word "coordinative," all of which connote different meanings. The opposite of coordinative is incoordinative which means lacking the ability to coordinate well. If something is erroneously managed or improperly coordinated, it can be called dis-coordination. Another opposing term to coordinative is dissimilar, which means fundamentally different in nature, value, or quality. Complex, unmanageable, or uncoordinated would be used in opposition to something being coordinative as well. Disorganized, disordered, and confused are more words that can be antonyms to coordinative, and they all indicate a lack of coordination or organization. In conclusion, there are many antonyms available for the word "coordinative," and choosing the right one would depend on the context in which the word is used.