regressive vs retrogressive

regressive and retrogressive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
regressive	No	Yes	No	No
retrogressive	No	Yes	No	No

regressive (adjective)	retrogressive (adjective)
opposing progress; returning to a former less advanced state	going from better to worse
(of taxes) adjusted so that the rate decreases as the amount of income increases