Regresively or Regressively: How To spell?
The word Regresively is misspelled against Regressively, an adverb meaning "In a regressive manner."
Regressively has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings regre & ively which should not be misspelled with single 'S'
Wrong Spelling:  regre-s-ively  Correct Spelling:  regre-ss-ively 
Find more wrongly spelled words of Regressively to spell it well.