Un-loosing meaning "tightening" has numerous antonyms that refer to different contexts of the word. Some of the antonyms include; relaxing, loosening, slackening, easing, weakening, and softening. These words suggest lessening the tension, reducing the power drain or stopping the anchor down automatically. For instance, loosening refers to slackening the grip, easing means reducing the strain or fatigue, while weakening implies the reduction in strength or intensity of a thing. Conversely, strengthening means increasing the intensity while fastening implies tightening up or binding things together more securely. Knowing the antonyms of un-loosing can improve your vocabulary and understanding of the word's context.