Hang-loose is a term used to describe a relaxed and carefree attitude. Its antonyms are words that convey the opposite meaning. Some of the antonyms for hang-loose are uptight, tense, anxious, nervous, worried, stressed, tense, and on edge. These words all suggest a state of mental or emotional tension, which is the opposite of feeling laid-back and at ease. Alternatively, words like strict, inflexible, and rigid can also serve as antonyms for hang-loose, indicating a strict adherence to rules and regulations, and a lack of flexibility or adaptability. Overall, the antonyms for hang-loose are words that suggest a state of discomfort, anxiety, or rigidity, which is the opposite of being relaxed and carefree.