Retrogresive or Retrogressive: How To spell?
The word Retrogresive is misspelled against Retrogressive, an adjective meaning "Passing from a higher to a lower condition; declining from a more perfect state of organization; regressive."
Retrogressive has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings retrogre & ive which should not be misspelled with single 'S'
Wrong Spelling:  retrogre-s-ive  Correct Spelling:  retrogre-ss-ive 
Find more incorrect spellings of Retrogressive to spell right way.