Completive is a term used to describe something that has been finished or completed. There are several synonyms that can be used to convey a similar meaning, such as finished, concluded, finalised, accomplished, and fulfilled. These words can be used to describe a task, project, or goal that has been successfully accomplished, meaning that it has concluded and reached its end goal. Additionally, words like attained, achieved, and realized can also be used as synonyms for completive, implying that what has been worked towards has finally been achieved, or reached its full potential. Overall, there are many words that can be used to describe the state of completion, depending on the context in which you are using them.