1. abhorrent
  2. retrograde
  3. obstructive
  4. regressive
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Answer: Option 4

Progressive : happening or developing gradually or in stages. Abhorrent : inspiring disgust and loathing; repugnant. Retrograde : directed or moving backwards. Obstructive : causing a blockage or obstruction. Regressive : returning to a former or less developed state; characterized by regression. Antonym of Progressive is Regressive

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