The word "un-coupled" means to disconnect or separate something that was previously connected or joined together. Antonyms for this word include attached, connected, linked, or coupled. These words convey the opposite meaning of un-coupled and imply that something is firmly connected or united. For example, a train car that is attached to another car is connected, while a ship that is coupled to a tugboat is linked. The antonyms of un-coupled denote a sense of union or continuity, making them incredibly important in several fields such as engineering, technology, and transportation.