There are several synonyms that can be used to describe ice cold juice. One of the most common is "chilled juice," which refers to juice that has been cooled in the refrigerator or with ice. Another option is "icy juice," which emphasizes the coldness of the drink. "Frosty juice" is also a good option, as it suggests that the juice is so cold that it has a layer of frost on the outside of the glass. Finally, "refreshing juice" can be used to describe any cold juice that helps quench thirst and provide relief from hot weather. Whatever synonym you choose, make sure it accurately reflects the cool and satisfying nature of a cold glass of juice on a hot day.