There are a number of synonyms for the word "regresses" that can be used to convey a similar meaning. Some of the most common synonyms include backsliding, deteriorating, declining, losing ground, and falling behind. Other options include decaying, retrogressing, weakening, degenerating, and slipping. Each of these words carries its own nuances and shades of meaning that can add depth and complexity to your writing. Whether you are discussing societal trends, personal growth, or statistical data, finding the right synonym can help you communicate your ideas more effectively and capture your audience's attention.