The term "most sweetened" refers to a substance that has been heavily sweetened to make it more appealing to the taste buds. However, there are several antonyms for this word, which describe substances that are not as sweetened. These antonyms include unsweetened, bitter, sour, salty, and bland. Unsweetened refers to substances that have not been sweetened at all, while bitter and sour refer to substances that have a distinctly bitter or sour taste. Salty refers to substances that have a high level of salt, while bland refers to substances that have a mild or unexciting taste. These antonyms can be used to describe a wide range of foods and beverages, such as coffee, tea, vegetables, and fruits.