What is the adverb for progressive?

There isn't a single, perfect adverb for "progressive" in the way that we have adverbs like "quickly" or "slowly."

The best way to express "progressive" with an adverb depends on the context:

* To express a gradual change: Gradually, incrementally, steadily, continuously

* To express ongoing action: Continuously, constantly, persistently, uninterruptedly

* To express a positive change: Positively, constructively, productively, dynamically

For example, you could say:

* "The company is making progressive changes gradually."

* "The team is working on a progressive project continuously."

* "The government is pursuing progressive policies dynamically."

The best adverb choice will depend on the specific meaning you want to convey.