The word "un-pinned" refers to the action of removing a pin or releasing something that was previously secured in place. Its antonyms, on the other hand, describe the opposite action of fixing, securing or attaching something. Some antonyms for "un-pinned" include pinned, fastened, fixed, attached, secured, affixed, and clamped. These words are commonly used in various contexts, such as sewing, carpentry, mechanics, and construction. For instance, a carpenter would "pin" two boards together using a nail gun, while a seamstress would "affix" a button on a garment using thread and needle. In essence, antonyms for "un-pinned" indicate an action of joining or securing two things together, while "un-pinned" describes the opposite.