The word "un-shut" means to open, but its antonyms vary depending on the context. For example, if referring to a door, the antonyms for "un-shut" would be to close or to shut. Similarly, when talking about a window, the opposite of "un-shut" would be to lock or to seal. However, when used in the context of a container, "un-shut" could be replaced with the antonyms "closed" or "sealed." In essence, the opposite of "un-shut" ranges from the simple act of shutting to the more specialized processes of locking, sealing or latching.