The word "un-loose" means to tighten, secure or fasten. It is a term commonly used when referring to objects or items that need to be fixed in place. The antonyms of "un-loose" are a group of words that refer to the opposite action of securing or tightening. These words include loosen, relax, untie, unbind, and release. When speaking about items such as knots or bolts, it is essential to understand the difference between loosening and un-loosening. Loosening refers to merely making the item less tight, whereas un-loosening suggests making it completely secure. It is important to use the correct antonym when conveying meaning in conversations.