retrogressive

[re-truh-gres-iv]
adjective
characterized by retrogression; degenerating.

Origin:
1795–1805; < Latin retrōgress(us) (see retrogress) + -ive

retrogressively, adverb
unretrogressive, adjective
unretrogressively, adverb


backward.


progressive.
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World English Dictionary
retrogress (ˌrɛtrəʊˈɡrɛs)
 
vb
1.  to go back to an earlier, esp worse, condition; degenerate or deteriorate
2.  to move backwards; recede
3.  biology to develop characteristics or features of lower or simpler organisms; degenerate
 
[C19: from Latin retrōgressus having moved backwards, from retrōgradī; see retrograde]
 
retro'gression
 
n
 
retro'gressive
 
adj
 
retro'gressively
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It is a retrogressive development to the business community.
If the radicals are not stabilized, retrogressive reactions producing materials
  difficult to liquefy will take place.
Once all the available hydrogen is used, retrogressive reactions will set in,
  leading to coke formation.
At higher reaction times, the net coal conversion decreased due to
  retrogressive reactions.
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