"The cool" is a common phrase used to describe something that is trendy, fashionable, or impressive. However, there are many synonyms that can be used to convey the same meaning. Some popular options include "hip," "groovy," "chic," "stylish," "fashionable," "trendy," "rad," "slick," "suave," "swanky," and "sophisticated." Each of these words has its own connotations and nuances, so it's important to choose the right synonym based on the context and tone of the sentence. By using synonyms for "the cool," you can add variety and interest to your writing while also conveying a sense of modernity and relevance.