Most malfunctioning is a term used to describe something that is not functioning properly or has a defect. However, there are many synonyms for this term, which can be used interchangeably depending on the context of the sentence. Some of the common synonyms for most malfunctional include faulty, defective, unreliable, dysfunctional, or broken. These terms are more specific in their meaning and can be used to describe different types of issues with a product or system. Using synonyms can help to avoid repetition in writing and convey a more precise meaning to the reader.