The opposite of "most shut" is "most open." This antonym applies to things like doors, windows, and curtains. When a door is "most open," it means it is wide and fully swung to allow passage. For windows, it indicates that they are unlocked, sashed up, and open to allow in air and light. When curtains are "most open," they are pulled away from the window and stay bunched flat, exposing the view outside. Additionally, the word "shut" can be related to being close-minded or secretive, making "most open" the antonym for those traits too. When someone is open to new ideas and willing to share their thoughts and feelings, they are "most open.