retrogressive (adjective)

1. Their once passionate relationship took a retrogressive turn and eventually ended in heartbreak.

2. The fashion industry experienced a retrogressive period in the 2000s when styles from the 1980s were reintroduced.

3. The comic book series had a retrogressive storyline where the hero's powers gradually weakened instead of getting stronger.

4. The horror movie took audiences on a retrogressive journey as the protagonist faced increasingly terrifying supernatural entities.