The word "un-affiliated" means not connected or associated with any group or organization. Its antonyms would be words that indicate a person or group is affiliated with another group or organization. Some antonyms for "un-affiliated" are affiliated, connected, joined, linked, attached, associated, partnered, and aligned. These antonyms suggest a sense of membership, membership in a group, or a sense of belonging to a group or organization. For example, someone who is affiliated with a political party is a member of that party and is involved in its activities. Being affiliated or connected carries a sense of responsibility and belonging that is not present in the term "un-affiliated.