IPA: /ˌrɛtrəˈɡrɛsɪvli/
KK: /rɛtrəˈɡrɛsɪvli/
In a way that involves returning to a previous state or condition, often worse than before.
The project was moving forward, but due to unforeseen circumstances, it started to develop retrogressively.
Retrogressively → It is formed from "retro-" (meaning backward) and "gressus" (from "gradi", meaning to step or walk) and the suffix "-ively" (meaning in a manner). The word describes the manner of moving backward or returning to a previous state.
Think of 'retro-' meaning backward and 'gressus' meaning to step — so retrogressively means stepping backward.