Antonyms for the word "un-attached" can be attached, connected, affiliated, allied, related, or associated. Being the opposite of unattached, these words signify a connection or relationship with something or someone else. For instance, an "attached" person can be someone who is in a committed relationship or someone who is closely affiliated with an organization or group. Similarly, a "connected" person can be someone who has a strong relationship with others or is closely tied to their emotions or feelings. Being "affiliated" or "allied" with a certain group or organization can also bring a sense of belonging and purpose to one's life.