The term 'back-water' is used to describe a state of being less advanced or less developed than others. Antonyms for the word back-water include phrases such as cutting-edge, advanced, innovative, modern, and contemporary. "Moving forward" is also an antonym, meaning advancing or progressing, as opposed to being stagnant or stuck in one place. Developed or avant-garde can also be used, indicating a place or culture that has moved beyond its former limitations. Ultimately, the opposite of back-water is a state of growth or advancement. Therefore, the above mentioned antonyms for the word back-water embody improvement or progress in terms of cultural, social, or economic aspects.