A non-cooperator is someone who refuses to work or cooperate with others. There are many different synonyms for this word, that can help to describe a person who is unhelpful or uncooperative. Some common synonyms for non-cooperator include a non-participant, an unresponsive individual, an uncooperative person, an obstinate person, a rebel, an uncompliant person, a resister, an evader, and a dissenter. Each of these synonyms brings a slightly different nuance to the meaning of non-cooperator. By using these different terms when describing someone who is uncooperative, we can highlight different aspects of their behavior and help others to understand why they are not working with others.