Synonyms for the word "radicalness" can help convey ideas of extreme or substantial change or innovation. One synonym is "revolutionary", which implies a complete overhaul of existing systems or ideas. Another synonym is "progressive", suggesting forward-thinking ideas or actions that challenge traditional norms. The term "avant-garde" refers to cutting-edge or experimental concepts that are ahead of their time. "Unconventional" denotes a departure from usual or accepted practices, often highlighting innovative or unorthodox approaches. Lastly, "groundbreaking" emphasizes the pioneering nature of an idea or movement. Utilizing these synonyms can add depth and variety to discussions about radicalness, amplifying the concept's significance in various contexts.