More regressive means becoming more backward or less progressive. The antonyms for more regressive could be "advanced," "developed," "forward-looking," "modern," "progressive," "radical," "reformist," "forward-thinking," "open-minded," and "liberal." Using these words will show the opposite meaning of regressive, which is a positive one. For example, if a country is becoming more regressive in terms of human rights, it means that they are moving away from social justice and equality. Conversely, if a country shows progressiveness towards the said topics, it reflects the country's social development and prosperity. In short, antonyms are the best way to showcase the opposite meaning of any word.