Non-functioning is a term used to describe something that is not functioning as it should. There are several synonyms for the word non-functioning, including inoperative, dysfunctional, broken, defective, faulty, out of order, unusable, and inactive. These words can be used to describe a wide variety of things, from electronic devices and machinery to organizations and systems. The use of these synonyms can help to add variety to your writing and speech, and can also help to provide a clearer understanding of what you are describing. By using synonyms for non-functioning, you can paint a more vivid picture of the situation or item you are describing.