The phrase "radically original" is correct and usable in written English.
You can use it to describe something that is completely new or different from anything that existed before. For example: The artist's new painting was radically original, blending abstract shapes with realistic images in a way no-one had ever seen before.
No, "Railroad Joint" isn't a great or radically original piece.
Here was America's most radically original fiction writer since -- who?
The radically original Ma Ke, who dresses China's First Lady, graduated from Central Saint Martins, in London.
Isa Genzken Radically original paintings from the 1980s and 90s by one of Europe's greatest living artists.
Not only does it illuminate the slow development of a radically original artist, but it is an interesting novel in its own right.
"Chronicle of a Summer" (Criterion), from 1960, is one of the most radically original documentaries ever made; even now, its frame-breaking psychodrama challenges the conventions of the genre.
Quite aside from the question of how "radically" modifies "original", the last thing Pierre wrote that was widely agreed to be all that good came out slightly more than 10 years ago.
The program's budget was cut radically from original estimates, and political support was meager, according to news reports.
As the project evolved, the state radically altered its original proposal, allowing for large gaps between the berm segments and easing concerns that the estuaries would be harmed.
The Apple designers also invented the menu bar, the pull-down menu, and the trash can — all features that radically simplified the original Xerox PARC idea.
Older organs needed to keep up with the times, so they were modified, sometimes so radically that their original tone could no longer be discerned.
