Non-productive refers to something that is not yielding any positive or constructive outcome. It is often associated with a wasteful or unproductive activity. Some synonyms for non-productive are unfruitful, idle, useless, inactive, ineffective, and unproductive. These words suggest a lack of progress or accomplishment. Non-profitable, non-essential, and non-professional can also be used as synonyms for non-productive. They all convey a sense of a lack of usefulness or value. These words are often used to describe activities or situations where resources are being wasted or results are not being achieved. To sum up, non-productive can be replaced with various other words depending on the context.