In-operative is a term used to describe something that is not functioning properly or is ineffective. There are several synonyms for this word that can be used to convey similar meanings. Some of these include non-functional, idle, ineffective, non-productive, unavailing, inefficacious, and useless. These words can be used interchangeably depending on the context and situation. For example, if a machine is not working, we can say it is non-functional, idle, or in-operative. Similarly, if an idea or plan is not yielding the desired results, we can use words like ineffective, unavailing, and inefficacious to describe it. In conclusion, having a strong vocabulary of synonyms for in-operative can help us communicate our ideas more precisely and effectively.